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We are recently using SmarterMail 12.4.5364
One of our customers uses EAS in combination with Outlook 2013. He permanently gets key mismatches, so that all of his mails are being delivered to him unread once more. There seems to be no particular interval for this error.
We were not able to solve this matter so that he has cancelled his account and changed to a Hosted Exchange solution.
The logfile states the following message repeatedly:
[2014.09.01] 08:20:51  <user>@<domain> 4086D84E37974C7497355020A4FBE806 WindowsOutlook15 v14_0
[2014.09.01] 08:20:51  IN : Sync (1.050 bytes)
[2014.09.01] 08:20:53  SYNC KEY MISMATCH: Device=[20140831.131023.1228] Server=[20140831.131041.1229]
[2014.09.01] 08:20:53  OUT: 200 (3.461.852 bytes, 1584 ms)