http://blogs.technet.com/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=CompanyA, cn=Mail.CompanyA.com"en-USCommunityServer 2.1 SP1 (Build: 61025.2)