More delays in the release schedule for Windows Vista revealed Friday hint that problems with getting the operating system out the door may be broader than Microsoft has articulated.Beta testers familiar with Microsoft's plans to release test versions of the operating system said that although Microsoft has said Vista development has been delayed a few weeks, the date the operating system will be released to manufacturers has been pushed back two months.Instead of reaching manufacturers on Aug. 25, as originally scheduled, Vista will now be released to them on Oct. 25, sources said. The next community technology preview (CTP) release of Vista, which is the completion of the Beta 2 cycle, also has been moved to May 24 from its original release date of April 12. Similarly, the first release candidate of Vista, originally set for mid-July, is now slated for Aug. 25.Microsoft said it is on track to release the next CTP of Vista in the second quarter, but has not given a more specific date than that.In a hastily scheduled conference call Tuesday, Jim Allchin, co-president of Microsoft's Platforms & Services division announced that the consumer versions of Vista would not ship on PCs until January 2007, though business customers will have access to Vista before the end of the year through the volume licensing channel. This means Microsoft and its hardware partners will miss selling Vista PCs during the busy holiday shopping season in the U.S. between late November and late December.Allchin characterized the delay in development as "a few weeks" on Tuesday's call. But a two-month change in the RTM of the product clearly suggests development is off track by more than that. Moreover, analysts said missing its target date for the holiday season gives Microsoft breathing room to push back Vista's release even further into 2007.PC sales are typically slower in the first and second quarters of the year, said Joe Wilcox, an analyst with Jupiter Research. "Microsoft missed the holidays, so January might as well be July," he said.Even a late October RTM is bumping up against a deadline for when OEMs would need Vista in order to get the system on PCs in time for January, he added.Countdown to Vista: The latest news, tests and opinions.