Windows 2008: Get RDS grace period status
Server Windows 2008 Remote Desktop Services have a grace period of 90 days from installation till day it lock access to users. Suddenly, there is no big red screen with countdown, or even small announce in Server Manager about expiration date. It somehow hidden, so eventually expiration date is usually not expected 
Now – Your business is down.
How You can connect locked Server? Run RDP client in Admin mode: mstsc /admin – to connect to locked server. Here You can configure licensing and add licenses.
By the way – You can see Days left by few ways:
1. in CMD (Run as Administrator) – paste and run:
wmic /namespace:\\root\CIMV2\TerminalServices PATH Win32_TerminalServiceSetting WHERE (__CLASS !=”") CALL GetGracePeriodDays
From Here – thx Ovi Borrero
2. Or You can use PowerShell script or VB to have this info – see MSDN
