Exchange ActiveSync HTTP 500 Exchange CAS/HUB 2007 and Exchange 2003 BE & MBX CCR 2007

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Exchange ActiveSync HTTP 500 Exchange 2007 $ 2003

OWA and related services work ok, only ActiveSync, does not work ?

If I run :

Test-ActiveSyncConnectivity -MailboxCredential $cred | fl

ScenarioDescription : Issue an HTTP OPTIONS command to retrieve the Exchange ActiveSync protocol version.

PerformanceCounterName : DirectPush Latency

Result : Failure

Error : [System.Net.WebException]: The remote server returned an error: (500) Internal Server Err

Set-EventLogLevel 'MSExchange ActiveSync\Requests' -Level Expert

Set-EventLogLevel 'MSExchange ActiveSync\Configuration' -Level Expert

No logs !

Users are not in any special AD group, and all have inherited… I create new user in new OU, no help…

Status :

At the morning I have remove FE Exchange 2003 server, I uncheck these is front end Exchange server. Rebooted server. After rebooted some services does not start, but I do not thing that is related. DNS points now to Exchange 2007 . OWA work perfectly, auto discovery for outlook work externali and internal. But ActiveSync has stopped. Users have setup with their mobile phone direct VPN link in to internal network. They use IP of Exchange 2003 BE server where mailbox reside. Til these morning it works, but now it doesn't. If I setup new mailbox in new Exchange 2007 server, Activ sync does not work. Error is the same as for users on BE exchange server, that has mailboxes ther.

I have become little stuck, with solution ?

Have any one any idea, where I`m missing a hint.

I had redirection so HTTS:\\ point to https\\\exchange, so that solution work perfectly with Exchange 2003 servers, but problem is the same if redirections active or is not.
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