Transferring PST file to a new computer gives an error

[Richard]

I use outlook 2003 and want to transfer my outlook.pst
file to my new computer (also outlook 2003). I tried
importing two different ways (1) file >
Open > outlook data file and (2) File > import and export

import from another program or file > Personal folder

file. Both give this error.

The file C:\outlook.pst is not compatable with this
version fo the personal folders information service.
Contact your administrator.

I also tried creating a new outlook file which is unicode
compatible. I still get the same error. Any ideas on how
to resolve this. Thanks in advance.