Cases heard in federal courts also tend to take longer to be resolved, and plaintiffs can lose some of their claims in summary judgment, said Michael Kuborn, an attorney representing Imagineering from the Curtis Law Office in Oshkosh, Wisconsin.

A lawyer representing Microsoft did not respond to a phone call requesting comment. A Microsoft spokesperson said via e-mail Friday that Microsoft is reviewing the allegations and will make its response in court.

Imagineering alleges in its complaint that on Oct. 7, 2005, it purchased Microsoft's LCS software, 1,500 Client Access Licenses and 1,500 External Connector Licenses for a total of $70,776. At the time LCS was Microsoft's software for providing a unified communications system, which links a company's voicemail, telephone system, e-mail and other employee communications services on the same software infrastructure.

MacMillan said Friday that Microsoft representatives had informed him that LCS had the capabilities his company needed to create a unified communications platform out of its disparate systems for telephony, voicemail, fax and e-mail. Microsoft also said it would provide remote desktop capability, which was key to Imagineering's deployment, he said.

Imagineering purchased the product and licenses mainly for an in-house deployment, but if that proved successful, the company planned to sell a similar offering to customers, MacMillan said.