Windows 7

Developer Microsoft Corporation Website Official Website Releases Release date RTM: July 22, 2009Retail: October 22, 2009 (info) Current version 6.1 (Build 7601: Service Pack 1) (February 22, 2011; 3 months ago) (info) Source model Closed source / Shared source License Proprietary commercial software Kernel type Hybrid Update method Windows Update Platform support IA-32 and x86-64