"Frank" wrote in message
...

How do I set up outlook 2007 (using Vista) with 3 email accounts. I want
outlook to prompt me "Which account to use" when I open outlook.

Then you'll need to put each account in its own mail profile and configure
prompting for which profile to use when starting Outlook because Outlook
cannot prompt for mail accounts, only profiles. Others are addressing your
second issue.
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Brian Tillman [MVP-Outlook]