MS Access 2003 MailMerge

We just upgraded to MS Office 2003 from 2000. Since the upgrade, my Access database will no longer MailMerge to Word 2003. I have a button on a form with VBA code to perform the merge function. I believe the VBA was written in 2000. I am able to merge (in general) from a document to an Access database/query, but not from Access to Word. Someone mentioned there is code to force VBA 2000 to run in 2003, but I can’t find it. Any ideas or thoughts? Please help!
Thanks.