Microsoft has reminded customers running Windows 2000, XP and Vista of approaching support deadlines for those versions of its software.
The closest cut-off is 13 April, when Microsoft will drop support for Vista RTM (release to manufacturing), the term used for the build the company launched at retail in January 2007. After that date Microsoft will not provide security updates for Vista RTM, said Jerry Bryant, a senior manager with the Microsoft Security Response Center (MSRC).
Instead, users should upgrade to Vista Service Pack 1 (SP1), or preferably, Vista SP2, Bryant said. Microsoft shipped SP1 and SP2 in March 2008 and May 2009, respectively.
Microsoft's policy is to support a Windows RTM build for at least 24 months after the release of a first service pack, and to support any service pack for the same length of time when it's superseded by a follow-up.
Both Windows 2000 and Windows XP face support deadlines of July 13, 2010, Bryant added in an entry last week to the MSRC blog.
Microsoft will retire Windows 2000 from all support in July, ending all security patches for the operating system that celebrates its 10-year anniversary this month.
Windows XP SP2, the popular 2004 update that beefed up the security of the under-attack OS, will also exit support on July 13. To continue receiving bug patches, users must upgrade to XP SP3, the May 2008 update. Bryant claimed that "many" customers are still using XP SP2, and urged them to upgrade to either SP3 or Windows 7.
According to web metrics company NetApplications.com, Windows XP powered 66 per cent of the machines that were online last month, while Vista ran 17.5 per cent and Windows 2000 just 0.6%.
Last week, Microsoft reminded users of Windows 7 Release Candidate (RC) that beginning on 15 February, the free preview will warn of a 1 March deadline. On 1 March, the operating system will start to shut down automatically every two hours.