BCM sometimes has what's known as a "forms cache" problem. Clearing the cache usually fixes it. Choose Tools | Options | Other | Advanced Options | Custom Forms, then click Manage Forms, then Clear Cache. If simply clearing the cache doesn't fix the issue, try the other steps detailed at http://support.microsoft.com/default.aspx?scid=kb;en-us;836558
The bulk of the forms cache issues in Outlook 2003 are fixed in Service Pack 1, so you should also install Office 2003 Service Pack 1 as well as BCM SP1.

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Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> all messages in my inbox are being attached to the account history for all of
> my accounts. this just started to happen today.