We have Exchange 2010 with only about 6 users on Outlook 2013. The rest of my users are using Outlook 2010 or below.
Anyway, for those 6 on 2013, 3 of them are experiencing an issue when they try to delete Outlook messages which include attachments.
when they click the Delete button in the message, a window pops up saying "Unknown Error."
the only option you have is to click OK. The message remains in the user's inbox.
These users are all WIN 7 Pro SP1 with Outlook 2013 installed and in online mode.
Any suggestions?