Exchange "Sent Items" Missing issue in Mail

I lost my "Sent Items" mails and sync. I have looked all over this place and found nothing, but this one worked for me, I`ve taken the idea from here (https://discussions.apple.com/thread/4173886?start=0&tstart=0) similiar to Calendar issue

Open Mail

1. Go to the Mail > Preferences.
2. Select the Accounts tab.
3. Remove the Exchange server account which is giving you the error messages. This mailbox will be removed from the Mail app.
4. Close Mail (cmd + Q)
5. Go to System Preferences and click on the "Mail, Contacts & Calendars" pane, find your Exchange server account, and check the "Mail" option to re-enable your Mail (I`ve got an "unknown problem" when activating, the last resort I tried was to close current session - and retrying this step - it worked for me this way)
6. Your Mail should now sync properly.

Hope it works for you