Not only is Microsoft hard at work on producing the first major update to the latest iteration of the Windows client, but the company is also working on the evolution of Windows beyond Service Pack 1. In this regard, the software giant has reportedly put together a post-Windows 7 RTM development milestone of Windows, full build string 6.1.7700.0.100122-1900. According to Wzor
, Build 7601.16486.100115-1536 does not belong to the Service Pack branch of Windows 7 and Windows Server 2008 R2, but to the winmain branch.
Full read here: Post-Windows 7 RTM Windows Build 6.1.7700 Leaked Information - 6.1.7700.0.100122-1900 - Softpedia