It's in your account settings, More settings, Advanced tab.
http://www.slipstick.com/Tutorials/more/settings.htm

--
Diane Poremsky [MVP - Outlook]
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Poll: What version of Exchange server do you use?
http://forums.slipstick.com/showthread.php?t=33803

"Racingdog" wrote in message
...
I set up my email on my new Blackberry Storm. Got an email from
Blackberry
that said:
"If you use Outlook to access your email messages, change your email
client
settings to leave your email messages on the server. If the email client
does not leave email messages on the server, the BlackBerry Internet
Service
may not be able to deliver them to your Blackberry"

Where do I find the option to leave email messages on the server? I
looked
under Tools OptionsPreferencesEmail options and couldn't find it.
THANKS!