LimitNone, a small software company has sued Google for copying its product - for Microsoft Office calendar items and email to Gmail.

An excerpt from Wired

The dispute centers around a LimitNone-developed tool that allows people to move Microsoft Office calendar items and email to the Google platform. The Chicago-based company claims it showed this tool to senior members of the Google Apps team in early 2007. The LimitNone team was repeatedly assured that Google would not roll out a competing product.

It does seem an obvious sort of application that Google would have wanted to develop. Though it does help that LimitNone will get a lot of publicity for this.