We have a few accounting users that share a mailbox for sending invoices out. All users are using Outlook 2007 SP2 on Windows XP. The mailbox lives on an Exchange 2010 server.
If the users send an email directly from Outlook, there is no issue.
However, our finance application uses an Outlook profile to send emails from their computers. The emails are delivered successfully, but they remain in the Outbox and don't show up in sent items.
This appears to affect all of the users that use that mailbox.
Some things we've tried:
- Cached and non-cached mode (no change in behavior)
- RPC over HTTPS and direct MAPI (no change in behavior)
We are going to see if we can upgrade one of the affected users to Outlook 2010 to see if that changes anything.