Microsoft yesterday announced it will ship a third and final service pack update for Office 2007 before year's end.

It appears that Microsoft will deliver Office 2007 Service Pack 3 (SP3) this month.

"The October 2011 release provides a six-month window to test and deploy the release prior to exiting mainstream support," Microsoft said in a blog post Thursday.

Office 2007, which went on general sale in January 2007 alongside Windows Vista, exits what Microsoft calls "mainstream support" in April 2012.

The suite will continue to be updated with security fixes for another five years after that, through April 11, 2017, during the "extended support" phase.

The biggest difference between the two support phases is that extended, non-security fixes are provided only to companies that have paid for special support contracts.

Microsoft, however, never issues service packs -- which are mostly composed of past security and other patches -- once a product is retired from mainstream support.

Full story: Computerworld