As this poll ( ) is now four years old and TSM v6.3 now drops supports for native zOS and 32 bit operating systems, I'd like to hear from those planning to upgrade to TSM v6.3 or have already upgraded as to what TSM server platform they are going to use.
We are looking at upgrading TSM 5.5 from Win64 and seriously want to deploy TSM v6.3 on AIX, but are getting a big management push to invest more infrastructure onto our Z-Linux infrastructure.