I wrote about this about two weeks ago in WinInfo, but Microsoft is again warning users about the end of support for some legacy Windows versions. Here's the heads-up.

Over the next several months, as part of Microsoft’s established support lifecycle policy, Microsoft will be ending support for Windows XP SP2, Windows Vista with no service packs installed (sometimes referred to as Windows Vista RTM/SP0), and all versions of Windows 2000.

The key dates customers need to be aware of are:

April 13th – On April 13, 2010, Windows Vista with no service packs installed will reach the end of support. End of support means there will be no more security updates for this version, though customers who are on SP1 or SP2 will continue to receive security updates and support.

July 13th –On July 13, 2010, Windows XP SP2 and all versions of Windows 2000 will reach the same milestone. In addition, Microsoft will be ending support for Windows Server 2000 and moving Windows Server 2003 from the Mainstream Support phase to the Extended Support phase.

Microsoft believes it is important that all customers take action prior to the end of support date, not only so that they know their options and can prepare, but also to ensure their environments are as secure as possible. That is why the company is taking a variety of steps, including:

Releasing new web content that went live today for consumers and businesses at the Microsoft web site, providing them with information and assistance for their support questions.

For enterprise customers, Microsoft and our partners are working directly with them on their migration plans.
Educating SMB customers about the “Up to Date Discount” program which enables Open Volume customers running older versions of Windows to upgrade to the latest Microsoft software at a discount

Outreaching through social media to consumers and small businesses

Posting additional resources through our customer support channels including online content and proactive discussions with customers who call in through support.

I think that should just about cover things. If you're actually using such a Windows version, I doubt you're reading my site anyway.