The fact that Microsoft is not calling it Service Pack 1, and the way Microsoft is positioning and deploying Windows 8.1 is significant, though.

FORBES: With Windows 8.1 All That Is Old Is New Again

Steven Levy (Newsweek) suggests that Google Pack helps Microsoft because it's basically a service pack for Windows.

ENGADGET: Live coverage of Google Keynote with Robin Williams

Steven Levy from Newsweek challenges Larry that Google Pack helps Microsoft because it's basically a service pack for Windows.

ENGADGET: Backstage at the Google press conference

Microsoft said it affected IE with Service Pack 1 installed but only if visiting websites that use data compression and the widely used version 1.1 of the HTTP web protocols.

BBC: NEWS | Technology | Hackers target latest Windows fix

According to the Microsoft Web site, the operating systems affected include Windows XP, Windows XP Service Pack 1, Windows 2000 SP2, Windows 2000 SP3 and Windows 2000 SP4.

CNN: Sasser worm rips through Internet

In its statement of objections, the Commission takes the preliminary view that Microsoft has failed to roll out the browser choice screen with its Windows 7 Service Pack 1, which was released in February 2011.

ENGADGET: EU antitrust commission charges Microsoft over browser selection 'breach'

The service pack incorporates all of the smaller patches and updates that precede it, but also gives Microsoft an opportunity to add new features, or make significant changes in the functionality of the operating system.

FORBES: With Windows 8.1 All That Is Old Is New Again

In a legal filing made Tuesday evening with the U.S. District Court for the District of Columbia, Microsoft agreed to make three changes to Windows Vista when it offers an update to the software, dubbed Service Pack 1, later this year.

FORBES: Microsoft Gives In To Google