Microsoft has recently received details of upcoming changes to the support of Windows 2000, Windows 2003 and Windows 2003 R2.
All three operating systems will change their support status on July 13, 2010. Extended support for Windows 2000 will come to an end meaning Windows 2000 public support will be non existent. Windows 2003 and Windows 2003 R2 will move into extended support meaning that Microsoft will continue to provide security updates and paid support. Non Security updates for Windows 2003 and Windows Server 2003 R2 will only be supplied to customers who enrol in Extended Hotfix Support (EHS), though program and per fix fees may still apply.
Of course to many people who are currently running Windows 2000 without any problems since they will still receive security updates this will cause no problem. However, with the recent release of Windows 7 which is generally regarded as a much better release than Windows Vista if appropriate budgets are available it could be a good time to look at both updating the OS running on both your servers and client workstations.