Hi shapi,
I am sorry that I misunderstand you case.
Did this issue occur on all users? We could refer to the following steps to check if the issue persist.
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Re-build profile
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Restart the service of Microsoft Exchange Transport and Microsoft Exchange Information Store
Outbox is used to temporarily store messages sent by the user until they're submitted to a Hub Transport server. A copy of sent messages is saved in the Sent Items default folder. Because messages usually remain in this folder for a brief period, it
isn't necessary to create an RPT for this folder.
So we should troubleshoot why sent items was in outbox. There are following steps for our troubleshooting:
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Did the issue occur all user?
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The same as former issue, we could rebuild profile to check if the issue persist,
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Check outlook if it is in cache mode,
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Check if there is 3<sup>rd</sup> party in add-in, we could move it to check if the issue persist,
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We could configure SendOne=0 in register by the following link: http://support.microsoft.com/en-us/kb/948984
If there are any questions regarding this issue, please be free to let me know.
Best Regard,
Jim