Add-ins are disabled if a process starts Outlook 2002

If you use a custom Component Object Model (COM) add-in with Microsoft Outlook, after you start Outlook, the add-in may not load or work correctly.

This problem may occur if another process, such as Microsoft ActiveSync version 3.5, starts Outlook but does not display any Outlook user interface. If this occurs and you then start Outlook as you typically do, Outlook does not load any COM add-ins.

Service Pack Information

This problem is corrected in Microsoft Office XP Service Pack 3.

To resolve this problem, obtain the latest service pack for Microsoft Office XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix Information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

The global version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. After the hotfix is installed, the following files will have the listed attributes or later:This fix is a post-Office XP Service Pack 2 (SP-2) fix. To install the fix, you must have Office XP SP-2 installed. For additional information about Office XP SP-2, click the following article number to see the article in the Microsoft Knowledge Base: Additionally, you may have to install Windows Installer 2.0 to install this fix. For additional information about the Windows Installer requirement for post-Office XP SP-2 fixes, click the following article number to see the article in the Microsoft Knowledge Base:
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk. After you apply the fix, enable the fix by adding the ForceOutlookSessionForOM value.

To do this, follow these steps:

1. Quit Outlook 2002.
2. Click Start, click Run, type regedit in the Open box, and then click OK.
3. Locate and then click the following registry key:
   HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Office\10.0\Outlook
4. Click Edit, click New, and then click DWORD Value.
5. Type ForceOutlookSessionForOM, and then press ENTER. This creates a new DWORD value named ForceOutlookSessionForOM.
6. With the new ForceOutlookSessionForOM DWORD value selected, click Edit, and then click Modify.
7. In the Value data box, type 1, and then click OK.
   
   Note Setting the ForceOutlookSessionForOM DWORD value to 0 will disable the fix.
8. Quit Registry Editor.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
This problem was first corrected in Office XP Service Pack 3.

If you do not have the hotfix installed and you re-enable the COM add-in so that it loads, it is not trusted in the Outlook 10 Security Settings folder.

For additional information about creating COM add-ins, click the article number below to view the article in the Microsoft Knowledge Base: For additional information about available resources and answers to frequently asked questions about Microsoft Outlook solutions, click the following article number to view the article in the Microsoft Knowledge Base: