Alain Caillet wrote:

I try to search knowledge base but could'nt find a clear answer.

I will soon move to a new PC on Vista with Office 2007.

1) will I be able to move/copy OTLK XP .pst personal and archive data
files to the equivalent OTLK 2007 data path on the new PC to get all
my mail accounts, contacts, personal and archive folders working in
OTLK 2007?

Never do this. First, placing PSTs in a particular folder is immaterial and
will not add them automatically even if they are in the default folder.
Second, if you overwrite an existing PST and that PST is part of a mail
profile, you will corrupt the profile.

or
2) do I have to use import to get these into blank default OTLK 2007
.pst file created during OTLK 2007 installation? (I am guessing blank
.pst files are created on install).

Never export to or import from a PST. It's unnecessary and you lose data.
Instead, use appropriate backup and restore procedures. See this:
http://www.howto-outlook.com/howto/backupandrestore.htm
--
Brian Tillman