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Had a migration from SM 14.3 to another server 14.4. Since migration any client using Outlook 2013/Android Mail and ActiveSync is getting no sync'd mail. Mail is coming in to the mail server and to the corresponding folders, but no sync at all.
In Outlook 2013 the connection jumps between 'Waiting for server response' to 'Connected' but no sync happens.
Here's from the log:
[2015.11.27] 13:22:43  SYNC KEY MISMATCH: Device=[20151126.205206.9] Server=[20151126.193210.1242]
How can we reset this sync key? Just to confirm, deleting the account and re-adding does work...so it is definitely to do with the new SM instance not liking the local Outlook/Android Mail profile.