A mockup of Dell&39's 10-inch, Windows 7-based tablet.

Dell's upcoming Windows 7 tablet might not hit store shelves until fall, a new report claims.

Citing an anonymous source, Forbes is reporting that Dell plans to launch its 10-inch Windows 7-based tablet as early as September.

Dell hasn't confirmed exactly when it might launch its Windows 7 tablet. When the company unveiled the device in February, it said that the tablet would hit store shelves by the middle of 2011. That announcement preceded a leak of Dell's reported "tablet roadmap," which indicated that the company could launch its Windows 7 tablet as early as mid-May. The roadmap also included mention of a Windows 8 tablet that could hit store shelves in the first quarter of 2012.

The PC maker declined to comment on Forbes' report.

According to Dell, its Windows 7 tablet is designed for those "who need greater mobility, as well as IT organizations that demand control, security, manageability, and integration with existing infrastructure investments." It will feature an Intel processor.

Dell also said in February that it plans to launch a 10-inch Android-based tablet as well, though it didn't provide many details on that device. The company currently sells the 5-inch and 7-inch Streak tablets. Both of those devices run Android.

Update at 7:46 a.m. PT to include Dell statement.