Depends on your mail support mode, which you failed to post.

Corporate/Workgroup mode:
Tools menu Options Internet Mail tab Check mail every X minutes box

Internet Mail Only mode:
Tools menu Options Mail Delivery tab Check mail every X minutes box
--
Russ Valentine
[MVP-Outlook]
"Lowell" wrote in message
ps.com...
I have MS Outlook 2000. At one point I selected from a dialog box
which mail account to use when automatically receiving mail. I have
since deleted that account. I have other mail accounts but I have to
send/receive them manually. Where is the dialog box for choosing which
accounts are used automatically?