Hi Chetan
I would love to have them all up on 12.1, but when you have prod.eq clients around the world, where some of them can't have MS security updates applied, disk limitations, ressource limitations, old OS and so on, then it will take 3+ year to get all of them upgraded.
We have done most of them, but there are still some left.
Now we can just see that the same will happen with SEP11, so now we have started the upgrade of this version aswell. :-)
Regards