Some - but not most - here are having their mail stuck in Outbox after we
upgraded to XP SP2.
Microsoft gives a 'workaround' but hopefully a patch will come out soon.
http://support.microsoft.com/default.aspx?scid=kb;en-us;883606
SYMPTOMS
After you install Microsoft Windows XP Service Pack 2 (SP2), when you try to
send a message in Microsoft Outlook, the message is not immediately sent.
The message remains in your Outbox folder longer than you expect.
WORKAROUND
To work around this problem, click a folder other than the Outbox folder, or
open any e-mail message. This action sends a remote procedure call (RPC) to
the Exchange server, and the e-mail messages in your Outbox folder are