We upgrade to Exchange 2010. We are still using the 2007 in co-existant mode. We needed a UCC certificate that we requested for the 2010 box, which is working fine. The certificate hosts: mail.company.com, legacy.company.com, and autodiscover.company.com.
The problem is when we exported it to the 2007 box, users are getting cert errors when they access the legacy address. The certificate they are being presented is the old one from our old 3rd party provider when it was just mail.commpany.com. I have tried removing the old certificate from mmc and also the exchange console. Users are still presented with the old certificate that has the wrong name.