The employee who installs the latest Vista build at home and squashes the most bugs before Monday will get an extra $500.
Brian Valentine issued the challenge Friday in an e-mail to members of the team working on, the next update of the company's Windows operating system.
The move comes as Microsoft is wrapping up work on a broad test version of Vista, expected by many Windows watchers to be released later this month. Microsoft has said it is on track to deliver a test version to roughly two million users this quarter.
Microsoft is pushing to wrap up development of Vista this year, with a mainstream launch slated for January. The company had long hoped to release it this holiday season, but in March announced that the launch.
Valentine's e-mail was noted earlier Friday by Windows enthusiast site ActiveWin.
As bug bounties go, it's small potatoes--though most others are for outsiders who report flaws. In February, VeriSign's iDefense offered for reports of flaws that end up with a "critical" severity rating in a Microsoft Security Bulletin. And Mozilla offersto those who find critical security flaws in its products, which include the Firefox Web browser.
CNET News.com's Joris Evers contributed to this report.