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You have to make sure your CA is up and running, then you go through exchange and renew the certificate.<br />
<a href="http://technet.microsoft.com/en-us/library/ee332322%28v=exchg.141%29.aspx" rel="ugc">http://technet.microsoft.com/en-us/library/ee332322%28v=exchg.141%29.aspx</a>
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You have to make sure your CA is up and running, then you go through exchange and renew the certificate.
http://technet.microsoft.com/en-us/library/ee332322%28v=exchg.141%29.aspx [http://technet.microsoft.com/en-us/library/ee332322%28v=exchg.141%29.aspx]

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We currently eperiencing a problem with our exchange server 2010 . its issuing an error that the certificate has expired, The said certificate is issued by our Domain Controller(2008 r2). how do we renew the certificate.
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We currently eperiencing a problem with our exchange server 2010 . its issuing an error that the certificate has expired, The said certificate is issued by our Domain Controller(2008 r2). how do we renew the certificate.

Exchange Certificate expired

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.