Users can not loggon to OWA!? (Password / Username incorrect)

Hello everybody,

I created a new environment for testing purposes. As Domain Controller I used a Windows 2003 Server Enterprise Edition R2 SP2 x86 (TEST-DC1). For Exchange I used a Windows 2003 Server Enterprise Edition x64 with Exchange 2007 SP1 x64 (TEST-MS1). For client and deployment Tests I used a Windows XP Pro SP3 x86 (TEST-PC1).

I integrated the TEST-PC1 and the TEST-MS1 in to the Domain testdomain.local. Worked out well. Runned Best Practice Analyser to test if everyting is okay on the Exchange Server. I diden't get any error messages. So I created some users on the TEST-DC1. Added them to the TEST-MS1 Exchange Server. Tried to loggon https://test-ms1.testdomain.local/owa but got a ERROR Password Username is wrong... But that's impossible i testet it on the TEST-PC1 for loggon to the domain PC worked out well. Tried again on the OWA. Still password wrong... Went to the TEST-MS1 logged the Administrator account off. Tried to loggin  on the machine as user1. Still password wrong...

What's the problem? I also run the Best Practice Analyser again and got this error message:
Active Directory domain 'TESTDOMAIN' has an unrecognized Exchange signature. Current DomainPrep version: 11221.
AND
Die Exchange-Schemaerweiterungen stammen aus einer unbekannten Version. Es wurde Schemaversion 11116 erkannt. (SORRY the Message is in GERMAN)

Regards,
CoDeX2k
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