I searched the forum for this title and found nothing related. The TAC Service Request Tool -- New Request page lists the following message:
MCS Serial Number
Some MCS (Media Convergence Server) serial numbers are being converted to a new number. If you have trouble opening a Service Request for MCS servers please call Cisco for support. We apologize for any inconvenience.
We have all MCS servers. I'm curious what this all about? Is it for old servers? New servers just purchased? Why?