Exchange OMA Problems HELP!

Exchange OMA was working without errors on my client's SBS server until they had a power failure.  Ever since that day they have not been able to synch with their phones.  On the hanheld I recieve the following error:
ActiveSync encountered a problem with the server.
Support Code: 0x85010014
On the server I recieve this error:
Source: Server ActiveSync   Event ID: 3005
Unexpected Exchange mailbox Server error: Server: [SERVERNAME.DOMAIN.local] User: [%username%@Domainname.com] HTTP status code: [501]. Verify that the Exchange mailbox Server is working correctly.

I have been working this on and off over the weekend and I need help :)  I have already tried checking for the required SBS registry entries for the VDirectory. I have recreated the virtual directories in IIS using metabase explorer. I have checked and rechecked permissions and settings.  When OMA worked previously I had Forms based Authentication enabled with no problems, but I have been trying to get it to work any way I can at this point haha. Any ideas??
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Leverage IT ConsultingAsked:
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Leverage IT ConsultingAuthor Commented:
Don't know if this helps, but when I browse the /exchange-oma directory in IIS i get a directory listing rather than the OWA that you would usually get. Thanks again
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SembeeCommented:
If you have played around with the IIS configuration, I would suggest a reset back to the default.

http://support.microsoft.com/default.aspx?kbid=883380

Remember to remove the virtual directory that you created AND its registry key.
Once you have reset everything back to the defaults, test again to see if OMA works.
If it does, then use my guide which has a few extra steps from 817379 to fix the problem.
http://www.amset.info/exchange/mobile-85010014.asp

Simon.
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Leverage IT ConsultingAuthor Commented:
Well thank you for the help.  It was a combination or recreating the OMA virtual Directory in the exchange system manager and recreating the /exchange-oma Vdir in IIS and importing the reg key.  
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