I've begun having difficulties using ActiveSync with my 6700. Frequently, the following error appears on the 6700 and on my PC:

"A critical error has occurred. ActiveSync can recover from this error, but the next time you sychronize, you may lose changes made since your last successful syncrhonization."

The associated Support Code for this error is 0x86000209.

Usually, after a few of these errors, the sync will succeed. But then the error will occasionally re-appear. What is this cause of this error? I didn't find much on the web nor on these forums dealing with this. Thanks.

I've had it happen occasionally also.
I believe it has something to do with a recent security update from MS for Outlook. But that is just a guess as timing could be coincidental.
There is nothing that I've been able to do to make it happen consistently or to make it stop permanently.

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Peace ~ Trident
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just a thought.

use mobile admin tool on the AS server to see if you have more than one association to the server.