Opening office 2007 documents (.docx, etc..) with Exchange 2003 webmail. keeps asking for password

keeps asking for password everythime we open a office 2007 document with the "x" at the end of it.
I added the extensions under exchange server IIS.
xlsx - application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

We have various operating systems (XP, Vista and 7 (32/64 bit) all having the issues.

We have a workaround where I have the Outlook clients using RPC over HTTP but I still would like to get this issue fixed.


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HaewoodConnect With a Mentor Commented:
There's a really good thread on this behavior here:

No real resolution, it looks like it's part of Office 2007's protocol discovery.  There are some offered workarounds in the thread though, so worth a look.
lanek2Author Commented:
Corrected by Changing the Exchange Virtual Server to Form Based authentication.
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