Bartering, especially of homes, has found a new, global life on the Internet.

Microsoft is closing Windows Live Expo, the classified advertising Web site that was initially seen as a potential competitor to Craigslist.

The online classifieds company filed a countersuit against minority owner eBay, accusing it of unfair competition, false advertising, trademark infringement and diluting the value of the Craigslist trademark.

In a statement, eBay said that in January, Craigslist executives took actions that “unfairly diluted eBay’s economic interest” in the company.