No. It will retain its previous format. Only a PST file newly created in
Outlook 2003 and 2007 will not have backwards compatibility (unless you
expressly create it in the older format).
--
Russ Valentine
[MVP-Outlook]
"Jonathan" <(E-Mail Removed)> wrote in message
news:1D8D57C6-6ED8-4D2D-95F8-(E-Mail Removed)...
> Hi,
>
> Does Outlook 2007 alter the file structure of an Outlook XP .pst file in
> such a way as to prevent it being backwards compatible with Outlook XP
> again.
>
> Anyone know?
>
> Thanks.
>
>
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