Trial versions are distributed to get people to try something new. XP 32-bit
has been out in release for several years, there is no need to market a
trial version. The 64-bit version is relatively new, at least in terms of
the version. It's not the XP OS that is new, but the fact that it is 64-bit
since most home and corporate users run 32-bit personal systems. The trial
is to get people to used to the new version, check for hardware
compatibility, and make sure their software runs ok in this environment. By
getting it widely distributed, it also begins to force the hardware
manufacturers to start writing and distributing 64-bit device drivers
(something they have been loathe to do at times).
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Windows help -
www.rickrogers.org