Not possible as IMAP accounts are a 2-way sync requiring their own delivery
store.
I fail to follow your reasoning why you need this for your BlackBerry.
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
http://www.msoutlook.info/
Real World Questions, Real World Answers
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"trfrantila" <trfrantila@discussions.microsoft.com> wrote in message
news:9B691DFA-3858-412D-BD85-EDBE6D5FC7B8@microsoft.com...
> On my outlook 2007, I have an existing .pst file into which I have been
> pulling in two POP3 email accounts. I now need to change one into an IMAP
> "pull" so that I can synchronize with my new blackberry (if someone has a
> better way of doing this please share - I cannot get it to reconcile to my
> Outlook on my laptop!). When I delete my one POP account and set it up as
> an
> IMAP account, Outlook creates for me a new, separate .pst folder. So, I
> now
> have email (in & out) located in two different files.
>
> How do I merge the two into one pst file again? This won't work for me,
> and
> surely other bb users make this work?
>
> Thank you