There are no incompatibility issues, but importing is a poor choice for
transferring data.
Just reuse your old PST file:
http://office.microsoft.com/en-us/assistance/HA010771141033.aspx
If for some reason you feel you need to use a UNICODE PST file, then just
open your old data file and copy what you want from it into your new one.

Signature
Russ Valentine
[MVP-Outlook]
>I want to back up my PST file from my old Outlook 2000 program and import
>it
> into my new Outlook 2003 program. Any problems with doing this
> (incompatibility issues)? What are the steps in 2003 for importing the
> data?
> Should I install the backup program first?
jlazarus - 26 Mar 2005 14:39 GMT
How does the old outlook data file work with the business contact manager?
Is there any way to bring the contact data into the business contact manager?
> There are no incompatibility issues, but importing is a poor choice for
> transferring data.
[quoted text clipped - 9 lines]
> > data?
> > Should I install the backup program first?
Russ Valentine [MVP-Outlook] - 26 Mar 2005 14:45 GMT
I would have no idea.
Ask in a BCM group.

Signature
Russ Valentine
[MVP-Outlook]
> How does the old outlook data file work with the business contact manager?
> Is there any way to bring the contact data into the business contact
[quoted text clipped - 14 lines]
>> > data?
>> > Should I install the backup program first?