Microsoft released a final update rollup for Windows 2000 on Tuesday (28 June) just two days before expiration of mainstream support of the still-widely-used operating system. The update contains every security patch issued since the release of Service Pack 4 and the end of April 2005 along with various non-security related software bug fixes.
The release is described as a consolidated update, rated than a service pack, and contains only a few items that have not already been issued as standalone fixes. Full details of the content of Update 1 for Windows 2000 SP4 - along with download instructions - can be found on Microsoft's website here. ®