Users of Apple's Boot Camp beta have been warned the trial version of the software is on track to expire this month.

The company's latest tech support posting for the software warns: "As indicated in the licence agreement for Boot Camp Beta, the Boot Camp Beta programme expires when Mac OS 10.5 Leopard becomes available publicly in October, 2007."

The note explains that the licence to use Boot Camp Beta 1.2 or earlier expired on 30 September, requiring users to upgrade to Boot Camp 1.4, which will work a little longer.

The Boot Camp 1.4 licence is set to expire when Mac OS X 10.5 is made available to the public. Apple has not yet disclosed a date for this release.

"To continue using Boot Camp at that time, upgrade to Mac OS X 10.5 Leopard," Apple warns.

Previous reports have indicated Apple may release a version of Boot Camp for use with Mac OS X 10.4, but the company's existing technical support warning offers no information as to such future plans.

Boot Camp allows users to run Microsoft Windows XP Service Pack 2 Home or Professional, or Windows Vista on Intel-based Macs.