Microsoft made Windows 7 operating system available from October 22, 2009 which was about three months back. A Microsoft centric Spanish blog Muywindows posted exclusive screenshots of Windows 7 Service Pack 1 Demo installer. Obviously, we foresee first Service Pack for Windows 7 in works at Microsoft's Labs.
Usually, the first Service Pack from Microsoft comes at least after a year the launch of Operating System. Windows Vista was launched on January 30, 2007 and its first Service Pack came out on February 4, 2008. Now, Windows 7 was launched globally on October 22, 2009 so ideally, we may expect the Service Pack 1 to arrive sometime year-end. That's when the Microsoft's Professional Developers Conference takes place.



Windows 7 Service Pack 1 is purported to have about 150 updates in the current build. One may expect support for newly released hardware and USB 3.0 supporting devices along with several other fixes. The blog also revealed that Microsoft will send them Windows 7 SP 1 Demo preview in coming few weeks. This Service Pack 1 will be passed to selected Testers in July and final version is expected in late 2010.
It's kind of early to predict when exactly will Microsoft release this first Service Pack. If we compare it with Apple's releases then Mac OS X Snow Leopard also got major updates in two weeks after the OS was released. Unlike Microsoft, Apple doesn't offer any 'Service Pack' for its OS but does release major updates time to time.