Apple's iCloud uses centralized servers to let users share music, photos and other data between handheld devices and computers.
iCloud communications, a company based in Arizona, says the service is identical to what it has offered since 2005. In its lawsuit filed Thursday, iCloud Communications claims that worldwide media coverage of Apple's new service has led the public to associate iCloud with Apple.
The suit seeks an unspecified amount of compensation. Apple representatives have not responded to requests for comment.