diff --git a/UI/Templates/MailerUI/UIxMailFolderTemplate.wox b/UI/Templates/MailerUI/UIxMailFolderTemplate.wox
index 6edccb294..9e5c1b57c 100644
--- a/UI/Templates/MailerUI/UIxMailFolderTemplate.wox
+++ b/UI/Templates/MailerUI/UIxMailFolderTemplate.wox
@@ -5,8 +5,11 @@
     xmlns:label="OGo:label">
   <div class="view-list" layout="column">
 
+    <!-- in virtual mailbox mode -->
+    <md-toolbar ng-hide="!app.showingAdvancedSearch || mailbox.selectedFolder.$selectedCount() > 0">
+    </md-toolbar>
     <!-- single-selection toolbars -->
-    <md-toolbar ng-show="mailbox.selectedFolder.$selectedCount() == 0">
+    <md-toolbar ng-hide="app.showingAdvancedSearch || mailbox.selectedFolder.$selectedCount() > 0">
       <!-- sort mode (default) -->
       <div class="md-toolbar-tools" ng-hide="mailbox.mode.search">
         <md-button class="sg-icon-button" label:aria-label="Search"
@@ -89,7 +92,7 @@
         <md-button class="sg-icon-button" ng-click="mailbox.unselectMessages()">
           <md-icon>arrow_back</md-icon>
         </md-button>
-        <label>{{mailbox.selectedFolder.$selectedCount()}} <var:string label:value="selected"/></label>
+        <label>{{mailbox.service.selectedFolder.$selectedCount()}} <var:string label:value="selected"/></label>
         <div class="md-flex"><!-- spacer --></div>
         <md-button class="sg-icon-button" ng-click="mailbox.selectAll()">
           <md-tooltip md-direction="bottom"><var:string label:value="Select All"/></md-tooltip>
@@ -147,17 +150,17 @@
 
     <md-content id="messagesList" layout="column" class="md-flex">
       <md-subheader>
-        <span ng-switch="mailbox.selectedFolder.$messages.length">
+        <span ng-switch="mailbox.service.selectedFolder.getLength()">
           <span ng-switch-when="0"><var:string label:value="No message"/></span>
-          <span ng-switch-default="true">{{mailbox.selectedFolder.$messages.length}} <var:string label:value="messages"/></span>
+          <span ng-switch-default="true">{{mailbox.service.selectedFolder.getLength()}} <var:string label:value="messages"/></span>
         </span>
       </md-subheader>
       <md-virtual-repeat-container class="md-flex">
         <md-list class="sg-section-list">
           <md-list-item
-              md-virtual-repeat="currentMessage in mailbox.selectedFolder"
+              md-virtual-repeat="currentMessage in mailbox.service.selectedFolder"
               md-on-demand="md-on-demand"
-              ng-class="{'sg-active': currentMessage.uid == mailbox.selectedFolder.selectedMessage, unread: !currentMessage.isread}"
+              ng-class="{'sg-active': currentMessage.uid == mailbox.service.selectedFolder.selectedMessage, unread: !currentMessage.isread}"
               ng-click="mailbox.selectMessage(currentMessage)"
               ui-sref="mail.account.mailbox.message({accountId: mailbox.account.id, mailboxId: (mailbox.selectedFolder.path | encodeUri), messageId: currentMessage.uid})"
               ui-sref-active="md-default-theme md-background md-bg md-hue-1">
@@ -172,7 +175,10 @@
             <div class="sg-tile-content">
               <span class="msg-date"
                     ng-bind-html="currentMessage.relativedate"><!-- date --></span>
-              <div class="sg-md-subhead-multi">{{currentMessage.$shortAddress('from')}}</div>
+              <div class="sg-md-subhead-multi">
+                <span ng-show="mailbox.service.$virtualMode">({{currentMessage.$mailbox.path}})</span>
+                {{currentMessage.$shortAddress('from')}}
+              </div>
               <div class="sg-md-body-multi">{{currentMessage.subject}}</div>
             </div>
             <div class="sg-tile-icons">
@@ -186,7 +192,7 @@
         </md-list>
       </md-virtual-repeat-container>
       <div class="sg-progress-circular-floating"
-           ng-show="mailbox.selectedFolder.$isLoading">
+           ng-show="mailbox.service.selectedFolder.$isLoading">
         <md-progress-circular class="md-accent"
                               md-mode="indeterminate"
                               md-diameter="32"><!-- progress --></md-progress-circular>
@@ -200,7 +206,7 @@
   </div>
 
   <div id="detailView" class="view-detail" layout="column" layout-align="start center"
-       ng-class="{ 'sg-close': !mailbox.selectedFolder.selectedMessage }"
+       ng-class="{ 'sg-close': !mailbox.service.selectedFolder.selectedMessage }"
        ui-view="message">
     <md-toolbar class="hide-sm"><!-- empty toolbar --></md-toolbar>
     <md-content class="hide-sm md-flex layout-fill md-hue-1" layout="column">
diff --git a/UI/Templates/MailerUI/UIxMailMainFrame.wox b/UI/Templates/MailerUI/UIxMailMainFrame.wox
index b18635a1d..ab6e25eb6 100644
--- a/UI/Templates/MailerUI/UIxMailMainFrame.wox
+++ b/UI/Templates/MailerUI/UIxMailMainFrame.wox
@@ -311,6 +311,12 @@
                       <var:string label:value="Export"/>
                     </md-button>
                   </md-menu-item>
+                  <md-menu-item>
+                    <md-button type="button"
+                               ng-click="app.showAdvancedSearch(folder.path)">
+                      <var:string label:value="Search"/>
+                    </md-button>
+                  </md-menu-item>
                   <md-menu-divider ng-show="folder.type == 'folder'"><!-- divider --></md-menu-divider>
                   <md-menu-item ng-show="folder.type == 'folder'">
                     <md-button type="button" ng-click="app.setFolderAs(folder, 'Drafts')">
@@ -345,8 +351,100 @@
   </script>
 
   <script type="text/ng-template" id="UIxMailFolderTemplate">
-    <md-toolbar layout="row" layout-align="space-between center" class="toolbar-main" >
-      <var:component className="UIxTopnavToolbarTemplate" />
+    <md-toolbar layout="row" layout-align="space-between center" class="toolbar-main" ng-hide="app.showingAdvancedSearch">
+      <var:component className="UIxTopnavToolbarTemplate"/>
+    </md-toolbar>
+    <md-toolbar layout="row" layout-align="space-between center" class="toolbar-main" ng-show="app.showingAdvancedSearch">
+      <div class="sg-padded" layout="column">
+        <div layout="row" layout-align="space-between center">
+          <md-input-container>
+            <label><var:string label:value="Search messages in"/></label>
+            <md-select ng-model="app.search.mailbox">
+              <md-option ng-value="">
+                <span>{{app.accounts[0].name}}</span>
+              </md-option>
+              <md-option ng-repeat="folder in
+                                    app.accounts[0].$flattenMailboxes()
+                                    track by folder.path"
+                         ng-value="folder.path">
+                <span ng-class="'sg-child-level-' + folder.level">{{folder.name}}</span>
+              </md-option>
+            </md-select>
+          </md-input-container>
+          <md-menu>
+            <md-button class="sg-icon-button" label:aria-label="More search options" ng-click="$mdOpenMenu()">
+              <md-icon>settings</md-icon>
+            </md-button>
+            <md-menu-content>
+              <md-menu-item>
+                <md-button ng-href="#">
+                  <md-checkbox ng-model="app.search.subfolders"
+                               ng-true-value="1"
+                               ng-false-value="0">
+                    <var:string label:value="Search subfolders"/>
+                  </md-checkbox>
+                </md-button>
+              </md-menu-item>
+              <md-menu-item>
+                <md-button ng-click="app.search.match='AND'">
+                  <md-icon ng-class="{ 'icon-check': app.search.match == 'AND'}">
+                    <!-- all --></md-icon><var:string label:value="Match all of the following"/>
+                </md-button>
+              </md-menu-item>
+              <md-menu-item>
+              <md-button ng-click="app.search.match='OR'">
+                <md-icon ng-class="{ 'icon-check': app.search.match == 'OR'}">
+                  <!-- any --></md-icon><var:string label:value="Match any of the following"/>
+              </md-button>
+              </md-menu-item>
+            </md-menu-content>
+          </md-menu>
+          <md-chips ng-model="app.search.params"
+                    md-on-append="app.newSearchParam($chip)">
+            <input type="text" ng-disabled="app.currentSearchParam.length == 0" sg-placeholder="app.search.options[app.currentSearchParam]"/>
+            <md-chip-template>
+              <span class="md-caption" ng-show="$chip.negative == 0">(match</span>
+              <span class="md-caption" ng-show="$chip.negative == 1">(does not match</span>
+              <span class="md-caption">{{$chip.searchBy}})</span>
+              <span>{{$chip.searchInput}}</span>
+            </md-chip-template>
+          </md-chips>
+        </div>
+        <div layout="row" layout-align="space-between center">
+          <md-button type="button" ng-click="app.addSearchParam('subject')">
+            <var:string label:value="Subject"/>
+          </md-button>
+          <md-button type="button" ng-click="app.addSearchParam('from')">
+            <var:string label:value="From"/>
+          </md-button>
+          <md-button type="button" ng-click="app.addSearchParam('to')">
+            <var:string label:value="To"/>
+          </md-button>
+          <md-button type="button" ng-click="app.addSearchParam('cc')">
+            <var:string label:value="Cc"/>
+          </md-button>
+          <md-button type="button" ng-click="app.addSearchParam('body')">
+            <var:string label:value="Body"/>
+          </md-button>
+          <div class="md-flex"><!-- spacer --></div>
+          <md-button type="button" class="sg-button"
+                     ng-disabled="app.search.params.length == 0"
+                     ng-hide="app.service. selectedFolder.$isLoading"
+                     ng-click="app.startAdvancedSearch()">
+            <md-icon>search</md-icon>
+          </md-button>
+          <md-button type="button" class="sg-button"
+                     ng-show="app.service.selectedFolder.$isLoading"
+                     ng-click="app.stopAdvancedSearch()">
+            <md-icon>stop</md-icon>
+          </md-button>
+        </div>
+      </div>
+      <div class="sg-toolbar-group-last">
+        <md-button type="button" class="sg-button" ng-click="app.hideAdvancedSearch()">
+          <md-icon>close</md-icon>
+        </md-button>
+      </div>
     </md-toolbar>
 
     <div layout="row" class="md-flex">
diff --git a/UI/WebServerResources/js/Mailer/Mailbox.service.js b/UI/WebServerResources/js/Mailer/Mailbox.service.js
index 766af6d70..1a6d09d4b 100644
--- a/UI/WebServerResources/js/Mailer/Mailbox.service.js
+++ b/UI/WebServerResources/js/Mailer/Mailbox.service.js
@@ -43,6 +43,7 @@
       $query: { sort: 'date', asc: 0 },
       selectedFolder: null,
       $refreshTimeout: null,
+      $virtualMode: false,
       PRELOAD: PRELOAD
     });
     // Initialize sort parameters from user's settings
@@ -272,10 +273,12 @@
       }
 
       // Restart the refresh timer, if needed
-      var refreshViewCheck = Mailbox.$Preferences.defaults.SOGoRefreshViewCheck;
-      if (refreshViewCheck && refreshViewCheck != 'manually') {
-        var f = angular.bind(_this, Mailbox.prototype.$filter);
-        Mailbox.$refreshTimeout = Mailbox.$timeout(f, refreshViewCheck.timeInterval()*1000);
+      if (!Mailbox.$virtualMode) {
+        var refreshViewCheck = Mailbox.$Preferences.defaults.SOGoRefreshViewCheck;
+        if (refreshViewCheck && refreshViewCheck != 'manually') {
+          var f = angular.bind(_this, Mailbox.prototype.$filter);
+          Mailbox.$refreshTimeout = Mailbox.$timeout(f, refreshViewCheck.timeInterval()*1000);
+        }
       }
 
       var futureMailboxData = Mailbox.$$resource.post(_this.id, 'view', options);
diff --git a/UI/WebServerResources/js/Mailer/MailboxController.js b/UI/WebServerResources/js/Mailer/MailboxController.js
index 0011ccca0..c2b8d2f77 100644
--- a/UI/WebServerResources/js/Mailer/MailboxController.js
+++ b/UI/WebServerResources/js/Mailer/MailboxController.js
@@ -10,7 +10,8 @@
   function MailboxController($state, $timeout, $mdDialog, stateAccounts, stateAccount, stateMailbox, encodeUriFilter, focus, Dialog, Account, Mailbox) {
     var vm = this, messageDialog = null;
 
-    Mailbox.selectedFolder = stateMailbox;
+    if (!Mailbox.$virtualMode)
+      Mailbox.selectedFolder = stateMailbox;
 
     vm.service = Mailbox;
     vm.accounts = stateAccounts;
@@ -33,7 +34,10 @@
     vm.mode = { search: false };
 
     function selectMessage(message) {
-      $state.go('mail.account.mailbox.message', {accountId: stateAccount.id, mailboxId: encodeUriFilter(stateMailbox.path), messageId: message.uid});
+      if (Mailbox.$virtualMode)
+        $state.go('mail.account.virtualMailbox.message', {accountId: stateAccount.id, mailboxId: encodeUriFilter(message.$mailbox.path), messageId: message.uid});
+      else
+        $state.go('mail.account.mailbox.message', {accountId: stateAccount.id, mailboxId: encodeUriFilter(message.$mailbox.path), messageId: message.uid});
     }
 
     function toggleMessageSelection($event, message) {
diff --git a/UI/WebServerResources/js/Mailer/MailboxesController.js b/UI/WebServerResources/js/Mailer/MailboxesController.js
index e417be4bf..29fdd6b9f 100644
--- a/UI/WebServerResources/js/Mailer/MailboxesController.js
+++ b/UI/WebServerResources/js/Mailer/MailboxesController.js
@@ -6,8 +6,8 @@
   /**
    * @ngInject
    */
-  MailboxesController.$inject = ['$state', '$timeout', '$mdDialog', 'sgFocus', 'encodeUriFilter', 'Dialog', 'sgSettings', 'Account', 'Mailbox', 'User', 'Preferences', 'stateAccounts'];
-  function MailboxesController($state, $timeout, $mdDialog, focus, encodeUriFilter, Dialog, Settings, Account, Mailbox, User, Preferences, stateAccounts) {
+  MailboxesController.$inject = ['$state', '$timeout', '$mdDialog', 'sgFocus', 'encodeUriFilter', 'Dialog', 'sgSettings', 'Account', 'Mailbox', 'VirtualMailbox', 'User', 'Preferences', 'stateAccounts'];
+  function MailboxesController($state, $timeout, $mdDialog, focus, encodeUriFilter, Dialog, Settings, Account, Mailbox, VirtualMailbox, User, Preferences, stateAccounts) {
     var vm = this,
         account,
         mailbox;
@@ -30,6 +30,93 @@
     vm.setFolderAs = setFolderAs;
     vm.refreshUnseenCount = refreshUnseenCount;
 
+    // Advanced search options
+    vm.showingAdvancedSearch = false;
+    vm.currentSearchParam = '';
+    vm.addSearchParam = addSearchParam;
+    vm.newSearchParam = newSearchParam;
+    vm.showAdvancedSearch = showAdvancedSearch;
+    vm.hideAdvancedSearch = hideAdvancedSearch;
+    vm.startAdvancedSearch = startAdvancedSearch;
+    vm.stopAdvancedSearch = stopAdvancedSearch;
+    vm.search = {
+      options: {'': l('Select a criteria'),
+                subject: l('Enter Subject'),
+                from: l('Enter From'),
+                to: l('Enter To'),
+                cc: l('Enter Cc'),
+                body: l('Enter Body')
+               },
+      mailbox: 'INBOX',
+      subfolders: 1,
+      match: 'AND',
+      params: []
+    };
+
+    function showAdvancedSearch(path) {
+      vm.showingAdvancedSearch = true;
+      vm.search.mailbox = path;
+    }
+
+    function hideAdvancedSearch() {
+      vm.showingAdvancedSearch = false;
+      vm.service.$virtualMode = false;
+
+      account = vm.accounts[0];
+      mailbox = vm.searchPreviousMailbox;
+      $state.go('mail.account.mailbox', { accountId: account.id, mailboxId: encodeUriFilter(mailbox.path) });
+    }
+
+    function startAdvancedSearch() {
+      var root, mailboxes = [];
+
+      vm.virtualMailbox = new VirtualMailbox(vm.accounts[0]);
+
+      // Don't set the previous selected mailbox if we're in virtual mode
+      // That allows users to do multiple advanced search but return
+      // correctly to the previously selected mailbox once done.
+      if (!Mailbox.$virtualMode)
+        vm.searchPreviousMailbox = Mailbox.selectedFolder;
+
+      Mailbox.selectedFolder = vm.virtualMailbox;
+      Mailbox.$virtualMode = true;
+
+      if (angular.isDefined(vm.search.mailbox)) {
+        root = vm.accounts[0].$getMailboxByPath(vm.search.mailbox);
+        mailboxes.push(root);
+
+        if (vm.search.subfolders && root.children.length)
+          mailboxes.push(root.children);
+      }
+      else {
+        mailboxes = vm.accounts[0].$flattenMailboxes();
+      }
+
+      vm.virtualMailbox.setMailboxes(mailboxes);
+      vm.virtualMailbox.startSearch(vm.search.match, vm.search.params);
+      $state.go('mail.account.virtualMailbox', { accountId: vm.accounts[0].id });
+    }
+
+    function stopAdvancedSearch() {
+      vm.virtualMailbox.stopSearch();
+    }
+
+    function addSearchParam(v) {
+      vm.currentSearchParam = v;
+    }
+
+    function newSearchParam(v) {
+      if (v.length && vm.currentSearchParam.length) {
+        var n = 0;
+        if (v.startsWith("!")) {
+          n = 1;
+          v = v.substring(1).trim();
+        }
+        vm.search.params.push({searchBy:vm.currentSearchParam, searchInput: v, negative: n});
+        vm.currentSearchParam = '';
+      }
+    }
+
     if ($state.current.name == 'mail' && vm.accounts.length > 0 && vm.accounts[0].$mailboxes.length > 0) {
       // Redirect to first mailbox of first account if no mailbox is selected
       account = vm.accounts[0];
@@ -121,6 +208,8 @@
       if (vm.editMode == folder.path)
         return;
       vm.editMode = false;
+      vm.showingAdvancedSearch = false;
+      vm.service.$virtualMode = false;
       $state.go('mail.account.mailbox', { accountId: account.id, mailboxId: encodeUriFilter(folder.path) });
     }
 
diff --git a/UI/WebServerResources/js/Mailer/Mailer.app.js b/UI/WebServerResources/js/Mailer/Mailer.app.js
index 3df880861..f55287905 100644
--- a/UI/WebServerResources/js/Mailer/Mailer.app.js
+++ b/UI/WebServerResources/js/Mailer/Mailer.app.js
@@ -39,6 +39,33 @@
           stateAccount: stateAccount
         }
       })
+      .state('mail.account.virtualMailbox', {
+        url: '/virtual',
+        views: {
+          'mailbox@mail': {
+            templateUrl: 'UIxMailFolderTemplate', // UI/Templates/MailerUI/UIxMailFolderTemplate.wox
+            controller: 'MailboxController',
+            controllerAs: 'mailbox'
+          }
+        },
+        resolve: {
+          stateMailbox: function(Mailbox) { return Mailbox.selectedFolder; }
+        }
+      })
+      .state('mail.account.virtualMailbox.message', {
+        url: '/:mailboxId/:messageId',
+        views: {
+           message: {
+            templateUrl: 'UIxMailViewTemplate', // UI/Templates/MailerUI/UIxMailViewTemplate.wox
+            controller: 'MessageController',
+            controllerAs: 'viewer'
+          }
+        },
+        resolve: {
+          stateMailbox: stateVirtualMailbox,
+          stateMessage: stateMessage
+        }
+      })
       .state('mail.account.mailbox', {
         url: '/:mailboxId',
         views: {
@@ -144,8 +171,8 @@
   /**
    * @ngInject
    */
-  stateMailbox.$inject = ['$stateParams', 'stateAccount', 'decodeUriFilter'];
-  function stateMailbox($stateParams, stateAccount, decodeUriFilter) {
+  stateMailbox.$inject = ['Mailbox', '$stateParams', 'stateAccount', 'decodeUriFilter'];
+  function stateMailbox(Mailbox, $stateParams, stateAccount, decodeUriFilter) {
     var mailboxId = decodeUriFilter($stateParams.mailboxId),
         _find;
     // Recursive find function
@@ -162,14 +189,22 @@
       }
       return mailbox;
     };
+
+    if (Mailbox.$virtualMode)
+      return Mailbox.selectedFolder;
+      //return $q.when(Mailbox.selectedFolder);
+
     return _find(stateAccount.$mailboxes);
   }
 
   /**
    * @ngInject
    */
-  stateMessages.$inject = ['stateMailbox'];
-  function stateMessages(stateMailbox) {
+  stateMessages.$inject = ['$q', 'Mailbox', 'stateMailbox'];
+  function stateMessages($q, Mailbox, stateMailbox) {
+    if (Mailbox.$virtualMode)
+      return [];
+
     return stateMailbox.$filter();
   }
 
@@ -181,12 +216,22 @@
   //   return stateAccount.$newMessage();
   // }
 
+  stateVirtualMailbox.$inject = ['Mailbox', '$stateParams'];
+  function stateVirtualMailbox(Mailbox, $stateParams) {
+
+    return _.find(Mailbox.selectedFolder.$mailboxes, function(mailboxObject) {
+      return mailboxObject.path == $stateParams.mailboxId;
+    });
+  }
+
   /**
    * @ngInject
    */
-  stateMessage.$inject = ['encodeUriFilter', '$stateParams', '$state', 'stateMailbox', 'stateMessages'];
-  function stateMessage(encodeUriFilter, $stateParams, $state, stateMailbox, stateMessages) {
-    var message = _.find(stateMailbox.$messages, function(messageObject) {
+  stateMessage.$inject = ['Mailbox', 'encodeUriFilter', '$stateParams', '$state', 'stateMailbox', 'stateMessages'];
+  function stateMessage(Mailbox, encodeUriFilter, $stateParams, $state, stateMailbox, stateMessages) {
+    var message;
+
+    message = _.find(stateMailbox.$messages, function(messageObject) {
       return messageObject.uid == $stateParams.messageId;
     });
 
diff --git a/UI/WebServerResources/js/Mailer/VirtualMailbox.service.js b/UI/WebServerResources/js/Mailer/VirtualMailbox.service.js
new file mode 100644
index 000000000..c7f4a3a94
--- /dev/null
+++ b/UI/WebServerResources/js/Mailer/VirtualMailbox.service.js
@@ -0,0 +1,219 @@
+/* -*- Mode: javascript; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+(function() {
+  'use strict';
+
+  /**
+   * @name VirtualMailbox
+   * @constructor
+   * @param {object} account - the mail account associated with the virtual search
+   */
+  function VirtualMailbox(account) {
+    this.$account = account;
+  }
+
+  /**
+   * @memberof VirtualMailbox
+   * @desc The factory we'll use to register with Angular
+   * @returns the VirtualMailbox constructor
+   */
+  VirtualMailbox.$factory = ['$q', '$timeout', '$log', 'sgSettings', 'Message', 'Mailbox', 'sgMailbox_PRELOAD', function($q, $timeout, $log, Settings, Mailbox, Message, PRELOAD) {
+    angular.extend(VirtualMailbox, {
+      $q: $q,
+      $timeout: $timeout,
+      $log: $log,
+      $Message: Message,
+      selectedFolder: null,
+      PRELOAD: PRELOAD
+    });
+
+    return VirtualMailbox; // return constructor
+  }];
+
+  /**
+   * @module SOGo.MailerUI
+   * @desc Factory registration of VirtualMailbox in Angular module.
+   */
+  try {
+    angular.module('SOGo.MailerUI');
+  }
+  catch(e) {
+    angular.module('SOGo.MailerUI', ['SOGo.Common']);
+  }
+  angular.module('SOGo.MailerUI')
+    .constant('sgMailbox_PRELOAD', {
+      LOOKAHEAD: 50,
+      SIZE: 100
+    })
+    .factory('VirtualMailbox', VirtualMailbox.$factory);
+
+  /**
+   * @memberof VirtualMailbox
+   * @desc Build the path of the virtual mailbox (or account only).
+   * @param {string} accountId - the account ID
+   * @returns a string representing the path relative to the mail module
+   */
+  VirtualMailbox.$absolutePath = function(accountId) {
+    return [accountId, "virtual"].join('/');
+  };
+
+  /**
+   * @function init
+   * @memberof Mailbox.prototype
+   * @desc Extend instance with new data and compute additional attributes.
+   * @param {object} data - attributes of mailbox
+   */
+  VirtualMailbox.prototype.init = function(data) {
+    this.$isLoading = false;
+    this.$mailboxes = [];
+    this.uidsMap = {};
+    angular.extend(this, data);
+    this.id = this.$id();
+  };
+
+  VirtualMailbox.prototype.setMailboxes = function(data) {
+    this.$mailboxes = data;
+
+    _.each(this.$mailboxes, function(mailbox) {
+      mailbox.$messages = [];
+      mailbox.uidsMap = {};
+    });
+  };
+
+  VirtualMailbox.prototype.startSearch = function(match, params) {    
+    var _this = this,
+        search = VirtualMailbox.$q.when();
+
+    this.$isLoading = true;
+
+    _.each(this.$mailboxes, function(mailbox) {
+      search = search.then(function() {
+        if (_this.$isLoading) {
+          console.log("searching mailbox " + mailbox.path);
+          return mailbox.$filter( {sort: "date", asc: false, match: match}, params);
+        }
+      });
+    });
+    
+    search.finally(function() { _this.$isLoading = false; });
+  };
+
+  VirtualMailbox.prototype.stopSearch = function() {
+    console.log("stopping search...");
+    this.$isLoading = false;
+  };
+  
+  /**
+   * @function getLength
+   * @memberof Mailbox.prototype
+   * @desc Used by md-virtual-repeat / md-on-demand
+   * @returns the number of items in the mailbox
+   */
+  VirtualMailbox.prototype.getLength = function() {
+    var len = 0;
+
+    if (!angular.isDefined(this.$mailboxes))
+      return len;
+    
+    _.each(this.$mailboxes, function(mailbox) {
+      len += mailbox.$messages.length;
+    });
+
+    return len;
+  };
+
+  /**
+   * @function getItemAtIndex
+   * @memberof Mailbox.prototype
+   * @desc Used by md-virtual-repeat / md-on-demand
+   * @returns the message as the specified index
+   */
+  VirtualMailbox.prototype.getItemAtIndex = function(index) {
+    var i, j, k, mailbox, message;
+    
+    if (angular.isDefined(this.$mailboxes) && index >= 0) {
+      i = 0;
+      for (j = 0; j < this.$mailboxes.length; j++) {
+        mailbox = this.$mailboxes[j];
+        for (k = 0; k < mailbox.$messages.length; i++, k++) {
+          message = mailbox.$messages[k];
+          if (i == index) {
+            return message;
+          }
+        }
+      }
+    }
+
+    return null;
+  };
+
+  /**
+   * @function $id
+   * @memberof VirtualMailbox.prototype
+   * @desc Build the unique ID to identified the mailbox.
+   * @returns a string representing the path relative to the mail module
+   */
+  VirtualMailbox.prototype.$id = function() {
+    return VirtualMailbox.$absolutePath(this.$account.id);
+  };
+
+  /**
+   * @function $selectedCount
+   * @memberof VirtualMailbox.prototype
+   * @desc Return the number of messages selected by the user.
+   * @returns the number of selected messages
+   */
+  VirtualMailbox.prototype.$selectedCount = function() {
+    // TODO
+    return 0;
+  };
+
+  /**
+   * @function $flagMessages
+   * @memberof VirtualMailbox.prototype
+   * @desc Add or remove a flag on a message set
+   * @returns a promise of the HTTP operation
+   */
+  VirtualMailbox.prototype.$flagMessages = function(uids, flags, operation) {
+    // TODO
+    // var data = {msgUIDs: uids,
+    //             flags: flags,
+    //             operation: operation};
+
+    // return VirtualMailbox.$$resource.post(this.id, 'addOrRemoveLabel', data);
+  };
+
+  /**
+   * @function $deleteMessages
+   * @memberof VirtualMailbox.prototype
+   * @desc Delete multiple messages from mailbox.
+   * @return a promise of the HTTP operation
+   */
+  VirtualMailbox.prototype.$deleteMessages = function(uids) {
+    // TODO
+    //return VirtualMailbox.$$resource.post(this.id, 'batchDelete', {uids: uids});
+  };
+
+  /**
+   * @function $copyMessages
+   * @memberof VirtualMailbox.prototype
+   * @desc Copy multiple messages from the current mailbox to a target one
+   * @return a promise of the HTTP operation
+   */
+  VirtualMailbox.prototype.$copyMessages = function(uids, folder) {
+    // TODO
+    //return VirtualMailbox.$$resource.post(this.id, 'copyMessages', {uids: uids, folder: folder});
+  };
+
+  /**
+   * @function $moveMessages
+   * @memberof VirtualMailbox.prototype
+   * @desc Move multiple messages from the current mailbox to a target one
+   * @return a promise of the HTTP operation
+   */
+  VirtualMailbox.prototype.$moveMessages = function(uids, folder) {
+    // TODO
+    //return VirtualMailbox.$$resource.post(this.id, 'moveMessages', {uids: uids, folder: folder});
+  };
+
+})();