diff --git a/NEWS b/NEWS
index 326290cbb..21ffc1339 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,7 @@
 
 Enhancements
  - [web] show calendar names of subscriptions in events blocks
+ - [web] allow to fetch unseen count of all mailboxes (#522, #2776, #4276)
 
 Bug fixes
  - [web] fixed wrong translation of custom calendar categories
diff --git a/UI/Templates/PreferencesUI/UIxPreferences.wox b/UI/Templates/PreferencesUI/UIxPreferences.wox
index 5a9742a02..cbc510c22 100644
--- a/UI/Templates/PreferencesUI/UIxPreferences.wox
+++ b/UI/Templates/PreferencesUI/UIxPreferences.wox
@@ -568,6 +568,16 @@
               </md-checkbox>
             </div>
 
+            <div>
+              <md-checkbox
+                  ng-model="app.preferences.defaults.SOGoMailFetchAllUnseenCountFolders"
+                  ng-true-value="1"
+                  ng-false-value="0"
+                  label:aria-label="Fetch count of unseen messages for all mailboxes">
+                <var:string label:value="Fetch count of unseen messages for all mailboxes"/>
+              </md-checkbox>
+            </div>
+
             <div class="ng-hide">
               <md-checkbox
                   ng-model="app.preferences.defaults.SOGoMailSortByThreads"
diff --git a/UI/WebServerResources/js/Mailer/MailboxesController.js b/UI/WebServerResources/js/Mailer/MailboxesController.js
index 554220a5c..f9f9ddb1a 100644
--- a/UI/WebServerResources/js/Mailer/MailboxesController.js
+++ b/UI/WebServerResources/js/Mailer/MailboxesController.js
@@ -267,19 +267,31 @@
     }; // delegate
 
     this.refreshUnseenCount = function() {
-      var unseenCountFolders = $window.unseenCountFolders, refreshViewCheck;
+      var unseenCountFolders, refreshViewCheck;
+
+      if (Preferences.defaults.SOGoMailFetchAllUnseenCountFolders === 1)
+        unseenCountFolders = [];
+      else
+        unseenCountFolders = $window.unseenCountFolders;
 
       _.forEach(vm.accounts, function(account) {
-
-        // Always include the INBOX
-        if (!_.includes(unseenCountFolders, account.id + '/folderINBOX'))
-          unseenCountFolders.push(account.id + '/folderINBOX');
-
-        _.forEach(account.$$flattenMailboxes, function(mailbox) {
-          if (angular.isDefined(mailbox.unseenCount) &&
-              !_.includes(unseenCountFolders, mailbox.id))
+        if (Preferences.defaults.SOGoMailFetchAllUnseenCountFolders === 1) {
+          // Include all mailboxes
+          _.forEach(account.$$flattenMailboxes, function(mailbox) {
             unseenCountFolders.push(mailbox.id);
-        });
+          });
+        }
+        else {
+          // Always include the INBOX
+          if (!_.includes(unseenCountFolders, account.id + '/folderINBOX'))
+            unseenCountFolders.push(account.id + '/folderINBOX');
+
+          _.forEach(account.$$flattenMailboxes, function(mailbox) {
+            if (angular.isDefined(mailbox.unseenCount) &&
+                !_.includes(unseenCountFolders, mailbox.id))
+              unseenCountFolders.push(mailbox.id);
+          });
+        }
       });
 
       Account.$$resource.post('', 'unseenCount', {mailboxes: unseenCountFolders}).then(function(data) {