Active Sync issues with attachments

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Good morning!

Exchange 2007 SP1. We have enabled and configured the Active Sync policy.
Nothing fancy and nothing secure. Still, users are having issues getting
the attachment (read: not getting them at all). AntiSpam is disabled (was
enabled and working just fine, but then we put in Postini and disabled
Anti-Spam),

No Edge Server in this single box environment.

Outside of looking in Postini where to start looking?

Thanks,

Cary


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