How do I access the reserved admin session using Microsofts RDP client on my Mac? The equivalent to
mstsc /admin on the Windows client.
I don't have my Mac in front of me however in a version prior to 2.1.0, there is an tick box option on the Remote Client Connection setup for an admin connection. It is labelled connect as Administrator if I remember correctly.
For version 2.1.0 and greater, see Christian Muggli's article Microsoft Remote Desktop Connection Console or Admin Session shows how you can put the /console or /admin directly at the end of server name of the RDC client (Mac or Windows).
Official confirmation on how to do this is via this Microsoft Help Article: How to connect to the Server Console
There are two programs I know of that are good for this.
To connect to the console in cord you can open it up and select; "connect to console session".
Diago's answer works for RDC