Out of Office and Free/Busy problems Exchange 2010

I've been searching EE for about a week now trying different solutions to this problem and I cant seem to lock it down.

I've migrated Exchange from an old SBS2003 server (still up and running, exchange and all) to a new server running Server 2008 and Exchange 2010.

Everything seems to be working great.  Autodiscover checks out fine on all computers.  OWA works great.  I do not have Outlook Anywhere installed, as I have no users connecting this way.  All clients are local and logged into the domain.  Also all cell phones are able to connect and send and receive email and calendering works too.

I have client computers that had Outlook 2010 installed before the migration and Free/Busy and Out of Office work fine on.  The rest of the clients are running Outlook 2007 and it does not work.  Upgrading these stations to Outlook 2010 does not solve the problem either.  Most stations are running Window XP and a couple have Windows 7

In IIS if I change EWS to ignore client certificates Free/Busy and Out of Office work just fine, except that it prompts for a password constantly.

I've tried too many things to list but am willing to try any ideas you may have.  

Thanks in advance.
CYSAdminAsked:
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CYSAdminAuthor Commented:
Well I figured it out a couple weeks ago.  Sorry for the late closing, but I was gone on vacation.  Apparently my WSUS wasnt pushing out SP2 for Office 2007.  As soon as I installed the SP the password prompt stopped showing up when I set EWS to ignore client certificates.
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ckeshavSr. Infrastructure SpecialistCommented:
If you are using a proxy server, then add a exclusion of your Exchange server IP/range and *.domain.com in your IE Proxy exclusion list
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CYSAdminAuthor Commented:
No proxy server.  Could it be a client side issue with Outlook?
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ckeshavSr. Infrastructure SpecialistCommented:
I have faced this issue. This happens normally if your Outlook is trying to get the OOF information from Internet.
Try disabling the Outlook Anywhere

If not proxy how is the internet access provided.
You can also try out disabling Internet on ID
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CYSAdminAuthor Commented:
I dont have Outlook Anywhere installed on the server.

I ran the Test Email-Autoconfiguration on a client that out of office doesnt work on and it shows the OOF in the proper place https:\\domain/EWS/Exchange.asmx 

I can browse to that location from the client as well.
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CYSAdminAuthor Commented:
No more ideas?  I've done some testing client side and I cant seem to find anything that is off.  Out of Office and F/B work great when I choose to ignore client certificates in EWS but I get an annoying password pop up.
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CYSAdminAuthor Commented:
Figured it out on my own.
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