After installing the MS10-064 security update for Office Outlook 2003, dated September 14, 2010, the Adobe Convert to PDF or other custom applications or add-ins appear to stop functioning.
The MS10-064 security update (KB 2293428) exposes a problem with the MAPIOBJECT property of the AddressEntry object in the Outlook Object Model (OOM). The failure prevents a custom application or add-in that accesses the MAPIOBJECT property from functioning properly.
This issue is fixed in the Outlook 2003 hotfix that is dated October 18, 2010. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2445403 Description of the Outlook 2003 hotfix package (Outlook.msp): October 18, 2010
Some customers that reported this issue were using Adobe 9.0, CS4 Standard or Professional, or PDF Maker Plug-in. The add-in would hang at the "Conversion in process" status.
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.