I've been a BlackBerry owner for several years. One of the reasons I've liked the BlackBerry is how reliable the email is. It just works.

In the last week or two, there have been a few emails at my work email which have not made it to my BlackBerry. I can access my work email via IMAP or OWA. I've tried both and had the same problem on both. This has happened more frequently at night.

Has anyone else seen this?

I'm on AT&T, BIS.

I have also experienced the same with BIS on T-Mobile. Do not know the reason for the same...

Did you guys try the usual trouble shooting of pulling out the battery and putting it back in? I don't really know how well IMAP work's on BB's but regenerating the encryption key on the BB usually does do the trick when your on BES and resending the service books.

I wonder if TMO and AT&T are upgrading their servers which might be causing some disruption in email.

Yep. Pulled the battery, resent the service books, dropped and readded the account to my BIS settings. This only seems to be happening on this one email server.