SBS2008 Echange url cert mismatch

I have a sbs2008 server which is in production. We tried to do everything using the wizards that come with the console. The SBS box was originally set up with the cert of remote.domain.com.

We found that the client had a Citrix server that already used remote.domain.com and changed the cert and URL to mail.domain.com. The remote web workplace and all functions of the box work fine except for a few users with Outlook 2007. These users get a cert popup stating the cert is mismatched. I googled the issue and found that the auto discover process is reading remote.domain.com from the Exchange server even though the Exchange server is displaying the mail.domain.com cert.

I see within the Exchange console==> Server Configuration==> Client Access shows remote.domain.com for internal web site url for OWA, Active Sync and OAB tabs. I was tempted to change this to mail.domain.com but I am weary of SBS boxes and any manual configurations.

Note: I have since removed the Citrix box and replaced it with a terminal server using the TSGateway provided by SBS.  remote.domain.com and mail.domain.com both point to my sbs box internally and externally now.

Can any tell me if this client access section of the Exchange MMC is indeed my culprit and how SBS would react to me manually changing that "Internal URL".

Thanks in advance