Tech giant, software maker Microsoft said that some of the Motorola's android smart phones uses similar tech which is based on Microsoft technology, which include synchronizing e-mail, calendars and contacts.
Microsoft filed its lawsuit in a federal court as well as filing one with the International Trade Commission.
Microsoft said Motorola licensed some of its mobile technology from 2003 to 2007 but continued to use the technology without renewing the license.
Its court filing specifically mentions the Motorola Droid 2 and the Motorola Charm smartphones, but Microsoft claims that the infringements were not limited to those devices.
In reply, Motorola spokeswoman said the company has not yet received a copy of the suit, but based on its strong intellectual property portfolio, plans to "vigorously defend itself".