Here's a look at some of the things that are making Microsoft headlines thus far today:

The Opera antitrust complaint has garnered lots of coverage. It's raising the specter of Microsoft's battles in U.S. courts and the recently resolved, mostly, clash with European Union regulators.

The news didn't trouble the market much. Microsoft's stock closed up 75 cents at $35.22. An analyst upgrade gets credit for today's boost to Microsoft shares. From The Associated Press
:

"In a Thursday client note, JP Morgan analyst Adam Holt said meetings with company executives and data from customer surveys imply the IT environment could be better than some predict in the fourth quarter and possibly in 2008 as well. Holt also expressed increasingly bullish sentiment about the company's organic growth prospects.

"Holt now expects Microsoft will report earnings of $1.82 per share in 2008, compared with an earlier estimate of $1.80 per share. He forecast profit of $2.07 per share, up from an earlier estimate of $2.05 per share."

Also of note today, Microsoft's offering in the virtualization space, Hyper-V, was released to beta testers. It will compete with VMware, one of the year's hottest tech IPOs. That company's stock lost 3.3 percent on the news. See coverage from Reuters.