Outlook 2007 is giving this message: "The messaging interface has returned an unknown error. If the problem persists, restart Outlook"

It happens when users are tying to save e-mail messages (as a .msg) file on a fileshare. Doesn't seem to matter what share they attempt to save to - and the only result is that in the folder itself it puts a .tmp file.

If the users retry the operation 2-10 times, they successfully complete the save.

Does anyone have a clue why this sometimes happen, and how one could fix it?

Note: This does not happen to all users.

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