Microsoft Corp. has once again shifted the schedule for the release of "Longhorn," the company's next major version of Windows, leaving some users up in the air about an upgrade path. Microsoft executives from Chairman and Chief Software Architect Bill Gates on down have long described Longhorn as the Redmond, Wash., company's most revolutionary operating system to date. The product was originally expected to ship next year. Then in May of this year, officials pushed back the release date to 2005. But now executives are declining to say when they expect the software to ship. Read more: eWeek.