IPhones lost contacts and e-mail when activesync server was down

We have about 20 iPhone 3GS syncing to our Exchange 2003 Server running on Windows Small Business Server 2003.
All iPhones have software 3.1
All iPhones were setup to use ActiveSync using iPhone Configuration Utility
Our Exchange server went down on a maintenance restart. When it was restarted we had some unknown failure to the ActiveSync functionality between IIS and Exchange. iPhones trying to sync got an HTTP 500 Error response, which I could see from the console log of the iPhone. The error message was:
Thu Oct 15 14:43:09 unknown dataaccessd[22] <Warning>: EAS|connection died with error Error Domain=ASHTTPConnectionErrorDomain Code=500 "Operation could not be completed. (ASHTTPConnectionErrorDomain error 500.)" 0x174480
Thu Oct 15 14:43:09 unknown dataaccessd[22] <Warning>: EAS|ASFolderSyncTask failed: Error Domain=ASHTTPConnectionErrorDomain Code=500 "Operation could not be completed. (ASHTTPConnectionErrorDomain error 500.)"
We rebuilt the Internet settings on the small business server and got the ActiveSync functionality working again. But this was after 24 hours.
All iPhones lost all e-mail during the 24 hours of ActiveSync downtime.
Approximately 60% of the iPhones lost all contacts during the downtime.
All iPhones kept their calendars during the downtime.
Other ActiveSync clients running Windows Mobile 6.1 or Symbian on Nokia N82 did not delete their contacts or e-mails during the downtime.
Is there any setting that governs this, may I say unexpected, behaviour? Makes it impossible to depend on iPhone e-mail - who knows when the Exchange Server will go down...
Does anyone know why 40% of the iPhones kept their contacts while the other 60% deleted them? They have all been purchased together and set up in the exact same manner.
I have tried to contact Apple support, but the automated voice just said that the network operator handles iPhone problems. The operator did not have a clue about Exchange servers and iPhones...
Thank you in advance!
Tobias

Usually once items are removed from the server, they are gone for good. Sorry to hear about the loss of contacts. We would like to check though to see if they can be retrieved. So we can get more information from you, I have copied your post to our private support board. Please refer all correspondences to there from here on out. You can easily get to the private support one of two ways. In the email you signed up for the forums with, you will receive a link to click on. Make sure you are already signed into the forums before clicking on this link. Another way of getting there is by clicking on your username anywhere you see it in the forums. This brings you to your account profile. Scroll down to the section labeled "My Support Cases" . In there you will see the link to your case.
Anthony_VZ
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