We are using Exchange 2007 SP1 and Outlook 2007 SP2. Most computers run on Windows XP, a few run on Windows 7.
A portion of the Windows 7 machines has the problem that always exactly ONE message is stuck in the Outbox. So, if Outbox is empty and the user sends a message, it remains in the Outbox. If he opens it from the Outbox and clicks "Send", it gets italic for a second and then is changed to normal font again and stays there.
As long as this one message is stuck there, the user can send all other messages. All mails are delivered perfectly. However, when he deletes this one stuck message, the next message will be stuck.
It would be a "workaround" to have always one stuck message there, but that can't be the real solution =) ... Does anyone have an idea on this issue?
The problem appears on 3 of about 20 Windows 7 computers, but on NONE of around 2000 Windows XP computers. The users are using Outlook Cache Mode.