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Installed add-in is not visible in Microsoft Outlook

Problem:

An Outlook add-in (e.g. one of the add-ins installed with CodeTwo products) is not visible in Microsoft Outlook after installation.

Solution:

To solve this problem, you need to delete the extend.dat file from the user's profile and check if the add-in is not listed among the disabled items.

Deleting extend.dat

If you are using Microsoft Outlook 2010 or 2013, skip this part and go to Check the Disabled Items.

To remove extend.dat, follow these steps:

  1. Exit Outlook.
  2. In Windows Explorer choose the Tools, Folder Options, View tab and select Show hidden files and folders.
  3. Go to the folder

    C:\Document and Settings\<user>\Local settings\Application data\Microsoft\Outlook

    where <user> is the name of the user's account in which the problem occurs.

  4. Find extend.dat in this folder and delete it.
  5. Restart Outlook.

Checking the disabled items

To check whether the add-in is listed in the disabled items, proceed as follows.

Microsoft Outlook 2003:

  1. From the top menu choose Help, and About Microsoft Office Outlook.
  2. Click Disabled Items.
  3. If the add-in is included on the list, choose it and click Enable.
  4. Restart Outlook.

Microsoft Outlook 2007:

  1. Choose Tools, Trust Center from the top menu and click the Add-ins tab.
  2. From the Manage drop-down menu, choose Disabled Items and click Go.
  3. If the add-in is included in the list, choose it and click Enable.
  4. Restart Outlook.

Microsoft Outlook 2010, 2013, 2016:

  1. Choose File, Options from the top menu and enter the Add-Ins tab.
  2. From the Manage drop-down menu, choose Disabled Items and click Go.
  3. If the add-in is included on the list, choose it and click Enable.
  4. Restart Outlook.

 

  • Applies to: Tools for Outlook
  • Categories: Troubleshooting
  • Last modified: 2017-12-13
  • Created: 2008-07-16
  • ID: 7
  • Keywords: CodeTwo Outlook Export, CodeTwo CatMan, add-in for Outlook, add-in, problem, issue, extend.dat, addin
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