Windows 7 is 1 year old, Windows platform soon to be 25

Having sold 240 million copies so far, Windows 7 is Microsoft's fastest selling OS. The Windows platform will be completing 25 years next month. To look back at Windows history, check the Windows 1.0 artifacts that Ray Ozzie has shared at docs.com, which now provides “browser-based PDF reading” through a Silverlight-based PDF viewer.

In other OS news, Google is readying its Chrome OS for the fourth quarter of 2010. Some points from the Chromium OS FAQ -

Google Chrome OS is to Chromium OS what Google Chrome browser is to Chromium. Chromium OS is the open source project, used primarily by developers, with code that is available for anyone to checkout, modify and build their own version with.

Google Chrome OS is not a conventional operating system that you can download or buy on a disc and install. As a consumer, the way you will get Google Chrome OS is by buying a netbook that has Google Chrome OS installed by the OEM.

...we are asking our hardware partners for Google Chrome OS to use solid state drives (SSDs) rather than hard disk drives (HDDs), for performance and reliability reasons.

Google Chrome OS is a web-centric system, so all applications are web applications

..Chromium OS is open source, and it's Linux.

The Chrome OS UI is under development but some preliminary designs are available

Also see:
The History of Microsoft