We are experiencing an issue with Outlook where it becomes disconnect (for no apparent reason) and will not reconnect. These users are able to connect to other intranet websites and servers, as well as ping the mail server. Their passwords have not expired and their able to use webmail. Send/Receive action returns an error that the mail server connection is unavailable. Both of these users/clients are on laptops with Office 2007 on Windows XP.
The first time this happened we were able to resolve the issue by restarting the mail server (not ideal).
The second time it occurred with the same user (and same client) and cleared its self up before we could resolve the issue.
Now it has happened on a second user/client and it has not fixed itself yet.