Microsoft on Monday began pushing the release candidate of Internet Explorer 9 (IE9) via Windows Update's automatic delivery service to users already running the unfinished browser.
The move is the first of several steps Microsoft will take as it wraps up development of IE9, then starts urging customers, especially consumers, to upgrade.
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IE9 Release Candidate, or RC, is the final preview before Microsoft gives the code the green light sometime before the end of March. The company shipped IE9 RC last Thursday.
"This rollout will start with a narrow audience and expand over the next few days to cover all Internet Explorer 9 beta users," the company said.
As it did with both IE8 and IE7, Microsoft will give IE9 beta users the option of rejecting or delaying the installation of the RC. Users will see a splash screen before IE9 RC installs that gives them three choices: "Ask me later," "Install" and "Don't Install." Users who pick the first option will see the upgrade offer after the next update session.
Only users running IE9's beta will see the automatic offer. Microsoft recently claimed that 25 million copies of the beta had been downloaded since September 2010.
At some point after the final release of IE9 -- Microsoft calls the milestone "RTW," for "release to the Web" -- the new browser will be offered to all Windows Vista and Windows 7 users, who have either IE7 or IE8 on their machines. If Microsoft repeats the timetable it used two years ago when it last upgraded the browser, it will kick off the IE9 updates to Vista and Windows 7 about six weeks after announcing RTW.
Windows XP users will see neither the IE9 RC or IE9 RTW offers because the browser does not work on the still-dominant operating system.
Microsoft has yet to set a date for IE9's final release, but has promised to ship the browser this quarter.