The latest delays to Microsoft's "Longhorn" version of Windows mean many firms may have to tear up their own desktop upgrade strategies.

Microsoft has told firms to wait until next month for clarification of its roadmap for Windows, after the latest delays to the next release left firms unable to plan for the future.

Earlier this month Microsoft said it could no longer give a target date for Longhorn, the delayed successor to Windows 2000 that was initially due to ship this year. It now seems unlikely to arrive before 2006.

Read more: CNet News.