oc-mail: activate user context needed

Before creating new sogo objects

OpenChange/MAPIStoreCalendarMessage.m

@@ -494,6 +494,7 @@ static Class NSArrayK, MAPIStoreAppointmentWrapperK;
   folder = [sogoObject container];
 
   /* reinstantiate the old sogo object and attach it to self */
+  [[self userContext] activate];
   woContext = [[self userContext] woContext];
   if (isNew)
     {

OpenChange/MAPIStoreMailMessage.m

@@ -1614,6 +1614,8 @@ _compareBodyKeysByPriority (id entry1, id entry2, void *data)
   max = [keyParts count];
   if (max > 0)
     {
+      [[self userContext] activate];
+
       currentPart = [sogoObject lookupName: [keyParts objectAtIndex: 0]
                                  inContext: nil
                                    acquire: NO];

OpenChange/MAPIStoreMailVolatileMessage.m

@@ -1077,6 +1077,7 @@ MakeMessageBody (NSDictionary *mailProperties, NSDictionary *attachmentParts, NS
       dd = [activeUser domainDefaults];
       from = [[activeUser allEmails] objectAtIndex: 0];
 
+      [[self userContext] activate];
       woContext = [[self userContext] woContext];
       authenticator = [sogoObject authenticatorInContext: woContext];
       error = [[SOGoMailer mailerWithDomainDefaults: dd]