I have a windows mobile phone and it stopped syncing with Exchange.  No reason.  Usually rebooting the phone fixes it (remove battery).  No dice.  In OWA you can login as yourself, go to options, mobile devices and remove your phone.  Then on your phone you can go ahead and do a send and receive and it will resync everything.  Not a big deal
unless you were sending a bunch of messages from your phone which is usually
unlikely.  Just a tip.

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