Outlook 2003 error message

[Josie]

When I try to send/receive using Outlook 2003 I get the
following message "The operation failed. Object could not
be found."

The following are things I have tried to fix this:

1) I have tested my user account settings for Outlook
2003. They are fine. The test e-mail is received by
Outlook Express.

2) I have removed my user account settings from Outlook
Express (which does send/receive e-mail).

3) Outlook 2003 is set as my default mail program.

4) Since Express works, I imported my account settings
from Express into Outlook and then deleted all account
info in Express.

Help would be so appreciated.

Thank you.