Office Communicator Certificate Error

I have 1 user that is all of a sudden getting an error when logging into Office Communicator 2007 "There was a problem in verifying the certificate please contact your systems administrator"   She states that nothing on her box changed or malfunctioned.  One day she was working with OCS just fine and the next this error appeared.  We have tried uninstalling and re-installing but get the same error.  I am not all that familiar with certificates so require assistance....

Thank you
Twhite0909Asked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
Is this the only user that is getting the error? or is it everyone that uses that office communicator server?
If it is the office communicator 2007 server
http://infrastructurehelp.wordpress.com/2012/07/30/updating-office-communications-server-2007-certificatesalternate-method/
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Twhite0909Author Commented:
Bueller...Bueller....
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David Johnson, CD, MVPOwnerCommented:
The certificate may have expired.  You will have to go into the user store in certmgr.msc and look for expired certificates
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Twhite0909Author Commented:
There are a ton of expired certificates.  Which one is for Office Communicator?  How do I install a new one?  Where does the new one come from

"I am not all that familiar with certificates so require assistance...."
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David Johnson, CD, MVPOwnerCommented:
Any that are expired you can delete. Look for the Key Usage Property.
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Twhite0909Author Commented:
There is not a Key Usage property.  This is on a Windows 7 box.  I see

Issued to
Issued by
Expiration date
Intended Purposes


However intended Purposes is VERY VERY vague and does not out right say "Office Communicator"  So what am I looking for here?
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Twhite0909Author Commented:
It is only happening to one user and yes it is Office communicator 2007.  Why would this happen to only one user?
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Twhite0909Author Commented:
OK so like I said IM a dummy when it comes to certs.  THsi is a good link but when it says the cert info and use ISS I have no idea what its talking about.  What on that HTTP link do I replace to get my IIS site and get a cert?  


Use the CA Web Site
 to get the certificates was to use the IIS site, https://NewCaName.CompanyName.com/certsrv.
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