An OL2003 format (unicode) pst is not accessible to OL2002 or earlier
You can, in OL2003 create an earlier version pst, or you can continue to use
your origonal 2002 pst in 2003.
The old format pst has a size limitation, the unicode does not. The unicode
is also apparently more robust.

Moving a pst or migrating to a functioning OL system using the incorrect
method will corrupt your pst and or profile
http://www.howto-outlook.com/howto/backupandrestore.htm

"UpinAK" wrote in message
...
I'm in the process of moving contact info from ACTS to Outlook 2002 on my
office system. I have Outlook 2003 on my laptop. I will be buying Outlook
2007 with a new office system. Will I be able to easily move my Outlook
data
to the laptop (2003) and then to the new system (2007) in the spring. If I
do
copy my .pst file to the laptop for a road trip or vacation, will I be
able
to update my current office computer with any changes from the laptop
(2003)
to my present office system (2002).

Thanks for any advise,

UpinAK