Late last week, MSXML4 SP3 was made available to the world.
Here are some highlights.
- Improved security and reliability. Kind of like MSXML6!
- No further SPs planned. Migrate to MSXML6!
- MSXML4 SP2 supports ends in November of this year. Migrate to MSXML6!
So if you can't move off from MSXML4, the SP3 is a good option for you. I've subtly hinted at a better alternative as well, but I wouldn't want to repeat myself.