Multple SAN Certificate

http://www.digicert.com/csr-creation-microsoft-unified-communications.htm

1.You need to include the fully-qualified domain name and netbios name of your Exchange server(s) (e.g, owa.domain.com and owa.local).
2.If you will be using the autodiscover service, you will need to include an entry for autodiscover (the autodiscover service will automatically use autodiscover.domain.com).
3.If you use the same URL for OWA, Activesync, Outlook Anywhere, or any other service you might be using on the Exchange 2007 server, and do not have any CAS servers involved, you should pretty much be covered.