"Business Contact Manager for Outlook could not complete" and one

When I start Outlook 2003, I get a message saying: "Business Contact Manager
for Outlook could not complete your last action or actions. Please try
again." The blue header on the error message says "BUsiness Contact Manager
for Outlook"

When I go to the "Contacts" tab, all my contacts are there, and I can add
new ones, edit old ones and delete any I want.

When I push the mail tab, everything shows up normally and I can compose,
read and delete e-mails. The problem arises when I push the button on the
"To". "CC" or "Bcc" button. Then I get the following error message: "The
messaging interface has returned an unknown error. If the problem persists,
restart Outlook."

If I type in the address, the e-mail works fine. It even autofills.

I'm using XP Home with all updates as of this morning, Windows Office Pro
2003 with all updates as of this morning. I use a fully implemented Windows
Live Care, and also use Ad-Aware, Registry Mechanic. I did a full virus scan
at midnioght last night (the problem has been going on for two days) and I do
a full Ad-Aware scan about three times per week, yesterday afternoon being
the most recent.

Any help greatly appreciated.