Exchange 2010 Renew Self-Signed Cert
Full Instructions are here.
Open Exchange Powershell
View your current cert and get the thumbprint:
Paste your thumbprint into this command and renew the cert for another 5 years:
Get-ExchangeCertificate –Thumbprint “28E9D9C0E81607JHJU0F6511AA17D418D4B3D8FD” | New-ExchangeCertificate
Your new cert has a new Thumbprint. Paste it into this command to enable it for IIS.
Enable-ExchangeCertificate –Thumbprint “ADC5062ED0BC269708E77D8588C833E054C9378D” –Services IIS
You’ll still need to load this new cert on all of your devices via group policy or whatever you did for your old cert. The new one won’t be trusted until you do.