Exchange: No Drag & Drop in Outlook (4282356)

After users migrate from Exchange 2010 to Exchange 2013, some have complained that they cannot move elements by drag & drop in a specific subfolder of the Inbox and its sub-folders in Outlook. It does not affect all users and but can be replicated as required. Alternative also show that:

• No new elements in these folders can be created
• Moving by right click -> Move to ... works
• In OWA, drag and drop works
• Only the related folders are affected
• There are no differences in the access rights between functioning and non-functioning folders.

A look at the MAPI properties of the folders by MFCMAPI showed the following:

• In Exchange 2010 for the folder concerned PR_CONTAINER_CLASS is missing completely
• In Exchange 2013 the "defective" folder property class exists, though this property is empty
• In both systems, the default folder and those that have been created by hand (and where drag and drop works without exception) the Property is set to the correct value "IPF.Note".

Manually setting the value of PR_CONTAINER_CLASS to IPF.Note for one of the "defective" folders immediately corrected the issue for that folder.