Cannot backup Open Outlook.PST file

[owain]

I have an evaluation copy of the software. I have tested that it backs up open Office files OK but it fails to backup my Outlokk.pst file if Outlook is open.

message I get is

Cannot read data. The process cannot acces teh file because another process has locked a portion of the file.

A am logged on as an Administrator account

The profile setting is ticked against - Try to copy files that are in use by other applications.

Am i doing somethign wrong ?

[owain]

I forgot to mention.

OS is Vista Home, Outlook is 2003