Outlook 2010 stripping attachments

I have a group of users on Outlook 2010 SP2. They have two accounts set up on their computers. One is their standard Exchange account, and the other is an IMAP account that they all share (it's a common departmental e-mail account).
Early last week, all the users except one encountered an issue where attachments sent from the IMAP account were being stripped by Outlook. Attachments sent from their individual Exchange accounts still go through without an issue.
I have been monitoring the logs on the SMTP server the IMAP account is set up to use, and the attachments never make it to that server, so they aren't being removed there. However, the attachments are still on the e-mail in the users' Sent folders on the
IMAP server. I tried 3 different SMTP servers we have available, and the result was always the same.
No changes were instituted on the computers (by me) prior to this happening. Out Exchange server is run by a different IT group, but like I said the IMAP account is somewhat isolated from Exchange.
It doesn't matter if the attachment is Word, PDF, image file, etc. It also doesn't seem to matter if they're inline (like an image) or not. They all get stripped. Logging has been turned on and I don't see any errors jumping out at me.
Things that I've tried that haven't worked:
Disable AV software (they're using SCEP 2012)
Using Outlook in Safe Mode
Starting fresh from a new Profile
Disabling TNEF in the registry
Making sure e-mail is sent as HTML, not as RTF
Erasing the Autofill cache
The only possible clue I've managed to find is after starting a user from a fresh Profile, I set up her IMAP account and tested it, and the attachments sent. Once I added her Exchange account, they started getting stripped again. This led me to think there
was a server issue again, except that it isn't affecting all users, just most of them.
Any ideas?

Hi,
If the Exchange account is removed from that profile, will the issue persist or disappear?
Have you also disabled the firewall to try again? If not yet, disable the firewall to test again.
Regards,
Melon Chen
TechNet Community Support

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Outlook 2010 stripping attachments

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