I have a single user using Outlook 2013 (version 15.0.4433.1507) on Windows 7 Pro with an Exchange 2007 server. The user has noted that several times when sending, the message will be saved to the Drafts folder and never sent. If he
re-opens the email and sends, it will usually work the second time.
I've not been able to find any other users with this issue and I can't identify any configuration issues on the server (we're a small outfit with just the one Exchange server. The config isn't very complex.).
Has anyone noticed a similar issue? If so, have you been able to resolve it?