has sued Microsoft for patent infringement, making a move in response to an intellectual property suit Redmond filed against the on-demand CRM (customer relationship management) vendor last month.

A number of Microsoft products, including its .NET platform and SharePoint collaboration software, are in violation of patents, according to the complaint filed on Thursday in U.S. District Court for the District of Delaware.

Microsoft has willfully infringed on's intellectual property, the complaint adds.'s legal team on the case includes David Boies, known for his role prosecuting the U.S. government's antitrust case against Microsoft. Boies is also representing Oracle in its ongoing intellectual-property suit against SAP.

Meanwhile, Microsoft's earlier complaint against alleges that the company's products infringe on nine of its patents.'s brash CEO, Marc Benioff, savaged Microsoft's action during a recent earnings call, labeling the company an "alley thug" and "patent troll."

But Benioff also said the dispute is "resolvable," and "basically a no-impact situation," remarks that's counter-complaint seem to place in a new light.

Neither company could immediately be reached for comment Friday.

Chris Kanaracus covers enterprise software and general technology breaking news for The IDG News Service. Chris's e-mail address is [email protected]