Windows will run as normal until 180 days. We will contact you after 94 days of subscription for install the license.
Remote desktop have 120 days of trial.
During this period Windows will display it's not Genuine Windows but will continue to run normally (even if some message said it's not)
You can just ignore the message or install Trial license key valid for 180 days :
Windows Web Server 2008 R2 : KBV3Q-DJ8W7-VPB64-V88KG-82C49
Windows Server 2008 R2 Standard : 4GGC4-9947F-FWFP3-78P6F-J9HDR
Windows Server 2008 R2 Enterprise : 7PJBC-63K3J-62TTK-XF46D-W3WMD
Windows Server 2008 R2 Datacenter : QX7TD-2CMJR-D7WWY-KVCYC-6D2YT