Where does Microsoft RDP 8 for Mac store its configuration
If you want to share a configuration you can select the target under My Desktops and either right-click and select Export or from the Microsoft Remote Desktop File menu select Export.

The file that contains the information shown in the Microsoft Remote Desktop window, sans any passwords which are stored in your Keychain, is located at:

/Users/$USER/Library/Containers/com.microsoft.rdc.mac/Data/Library/Preferences/com.microsoft.rdc.mac.plist