http://blogs.technet.com/b/danielkenyon-smith/archive/2009/06/18/exchange-2007-sp1-certificate-generation.aspxI created a cert the other day for a customer so thought I'd share the Powershell command, you never know it might help! New-ExchangeCertificate -GenerateRequest -Path c:\CompanyA.csr -KeySize 2048 -SubjectName "c=GB, s=London, l=London, o=CompanyAen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)