IPhone Slow to Open Messages

We have roughly 80 iPhones deployed all tied to Exchange 2003. These are mostly iPhone 4 and about 10 iPhone 4S units. We have one iPhone 4S which is problematic. It is running IOS 5.0.1 (as most of them are) and opens e-mail very slowly. By open I don't mean pulls down from server. It's in the list of items, you click it, and it's very slow to open. We decided to erase the iPhone and then restore. Same issue. We then placed the phone in recovery mode, and restored. Same thing. I then took an iPhone 4, erased and loaded a fresh copy of IOS 5.0.1. Activated e-mail only (no restore pulling in data to eliminate any apps or other items that might be causing the issue) and the same thing occurs. We tested both over Wifi and 3G and same result. This caused me to believe there must be something wrong with the individuals Exchange mailbox. My next move was to have them move everything out of their mailbox to an archive eliminating a high e-mail count in the mailbox. Still the same issue. Oddly, the same person has an first gen iPad, configured the same way and it open the emails very quickly which would then basically rule out the Exchange e-mail account. Anyone have some ideas?

I have been fighting the same thing for many moons. My Exchange provider has no clue. I upgraded my 3 GS to IOs 5 and this is what happened. I subsequently got a 4S (iOS 5.x), same trouble.
The provider had me change the server I connect to. After it all resyncs, I'll see if it's better. If not, I am going to disable Activesync on the server, and then re-provision it and start over. Don't know what to do after that. Gmail works fine.
My provider said it was a known issue with iOS 5 and it is the fault of Microsoft's activesync serever software. To my knowledge they have been unable to get a patch from Microsoft. My iPad works fine 99% of the time. And what is stranger, other users in my organization have no issues. Weird.

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