Like over on the Windows 8 Forums, it will be interesting to see (in one week we will know for sure) whether security updates and patches from the initial release of Server 2008 will be able to be manually applied to Windows Vista, on an ongoing monthly basis. This would extend "update support" until January 2020.
Now I'm not going to spear-head the Vista initiative, but I still think it should happen, and I will be watching very closely. I would think something like this would be top of
An interesting little change I noticed in the April 2019 update rollup:
For those that didn't notice, since 2009 with the release of SP2, Windows Vista's build number has been 6.0.6002 (while SP1 was build 6001, and RTM 6000). However, with the new rollup, Vista's build number has been changed to build 6.0.6003. At first I wondered if this was an error/discrepancy on MS's part, but turns out the change was intentional, according to this article: https://support.microsoft.com/en-us/hel