'Error in registry for extension "Exchange Extensions;?"' error message when you start Outlook 2003 or when you open and then close the Add-In Manager dialog box in Outlook 2003 (823633)


The information in this article applies to:

  • Microsoft Office Outlook 2003
Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

When you start Microsoft Office Outlook 2003 or when you open and then close the Add-In Manager dialog box in Outlook 2003, you may receive the following error message:
Microsoft Office Outlook

Error in registry for extension "Exchange Extensions;?".
The syntax or format of the registry entry is incorrect. Check the registry settings and compare the registry for this extension to other extensions in the registry.

CAUSE

This problem may occur if you follow these steps:
  1. Send an e-mail message to a recipient by using the following method:
    • Right-click an object, point to Send To, and then click Mail Recipient.
  2. Wait 24 hours or more.
  3. Send a second e-mail message to a recipient by using the method that is described in step 1.
After you send the second e-mail message, the Exchange Extensions string value in the registry is corrupted.

RESOLUTION

This problem was first fixed in a hotfix that is now contained in a service pack. If you installed the latest Microsoft Office 2003 service pack, you do not have to install the hotfix.

Service pack information

This problem is corrected in Microsoft Office 2003 Service Pack 1 (SP1).
To resolve this problem, obtain the latest service pack for Microsoft Office 2003. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

870924 How to obtain the latest service pack for Office 2003

Hotfix information

How to obtain the hotfix

This issue is fixed in the Outlook 2003 Hotfix Package that is dated March 2, 2004. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

835210 Description of the Outlook 2003 hotfix package: March 2, 2004

WORKAROUND

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.
To work around this problem, follow these steps.

Note The Exchange Extensions string value in the registry may become corrupted again and you may have to repeat these steps.
  1. Quit Outlook 2003.
  2. Click Start, click Run, type regedit in the Open box, and then click OK.
  3. Expand the registry, and then click to select the following subkey:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\Client\Extensions

  4. Right-click Exchange Extensions, and then click Delete.
  5. Click Yes to confirm the deletion of the Exchange Extensions string value.
  6. On the File menu, click Exit to quit Registry Editor.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This problem was first corrected in Office 2003 Service Pack 1.

MORE INFORMATION

To open the Outlook 2003 Add-In Manager dialog box, follow these steps:
  1. On the Tools menu in Outlook 2003, click Options.
  2. On the Other tab, click Advanced Options, and then click Add-In Manager.
Modification Type:MajorLast Reviewed:4/7/2006
Keywords:kbQFE KBHotfixServer kbOffice2003sp1fix kberrmsg kbOffice2003preSP1fix kbfix kbbug KB823633 kbAudITPRO kbAudEndUser
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