Tech in the 603, The Granite State Hacker

Windows Phone Email Sync Error Code 8500201F

A reminder to myself, and anyone else who may encounter this issue.  I have occasionally run across it and finally nailed down the symptom and work-around solution…   The problem is that in rare (maybe once in six months or so) I would get an error while syncing my mail in Windows Phone.  It’s an Exchange server, getting at the mail through OWA, and the fact that the error appeared & disappeared without warning, and only affected me, made it very mysterious. 

To make a long story short, sent a message to a fictitious address on my own email server trying to test something, and naturally got a administrator’s “non-deliverable address” message back.   This NDA message in my in-box was causing the error code 8500201F, making my phone fail to sync.  I discovered this by cleaning out my in-box, which got sync working again.  I then started putting messages back a few at a time until sync failed again.  I eventually narrowed it down to that NDA message.  Not sure why it’s a problem, but that’s what it was.

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