Do the instructions here help sort this out for you:

http://www.slipstick.com/outlook/choosingmode.htm

--�
Milly Staples [MVP - Outlook]

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After furious head scratching, Craig M asked:

| I'm setting up outlook 2000 sp3 on a new computer. I want to switch
| from cw to imo so I can have the accounts button. Both my acounts
| were working fine in cw. But when I switched to imo I get either a
| 0x800ccc15 tcp/ip error or a 0x8000ccc19 timeout error. I tried
| deleting and recreating the accounts. I tried disabling my virus scan
| of email. Didn't help. Switched back to CW and it works fine. How do
| I get it to work in imo mode?