I do some side consulting work and was asked if it was possible to run Office 2010 and Office 365 Pro side by side on Windows Server 2008 R2 RDS. I know they have Office 2010 already on Windows Server 2008 R2 RDS and Windows 7 workstations and they have a few that are running Office 365 and use Office 365 for their email (this is a medical office). I was asked if it was possible for users to continue using Office 2010 on RDS while limiting Office 365 to 3 users on RDS.
FYI
a few weeks ago I migrated them from Windows Server 2003 domain controller to Windows Server 2012 R2 a few weeks ago.