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Outlook addin error – Addin cannot be loaded and has been disabled by Outlook

I thought of blogging about this error since some of the Addin companies have mentioned in their website that Exchange is causing this issue and to perform steps which has nothing to do with the error.

Error: The Add-in “Addin Name” (C:\Program Files\AddinLocation\addin.dll) cannot be loaded and has been disabled by Outlook. Please contact the Add-in manufacturer for an update. If no update is available, please uninstall the Add-in.

We get this error every time we open outlook and keeps appearing at the time of Outlook startup.The error simply means that you are trying to load an addin for MS Outlook which is no longer available.

Please ensure that:

  • Outlook –> Tools –> Trust center –>Addins – The addin is no longer seen
  • Addin is uninstalled from Add/Remove programs
  • The Addin Location in the error message is no longer present

Solution:

  1. Navigate to Registry editor and do a search for the addin.dll in the error message. Delete the entries post looking at the path and ensuring it has something to do with Outlook
  2. Navigate to: C:\Documents and Settings\USERNAME\Local Settings\Application Data\Microsoft\Outlook and delete “extend.dat”. This file caches the addin information for Outlook. You might have to close Outlook before doing this

Ratish Nair
MVP Exchange
Team @MSExchangeGuru

Keywords: The Add-in “Addin Name” (C:\Program Files\AddinLocation\addin.dll) cannot be loaded and has been disabled by Outlook. Please contact the Add-in manufacturer for an update. If no update is available, please uninstall the Add-in, Outlook addin error, Unable to uninstall Outlook addin

3 Responses to “Outlook addin error – Addin cannot be loaded and has been disabled by Outlook”

  1. Anita Says:

    This is cool stuff 🙂

  2. Nilesh S Says:

    This error is also seen in certain cases wherein you have Exchange System Manager (ESM) for Exchange 2003 and Outlook (with Office Live Meeting Conferencing add-in) installed on your machine. This is a common error in this kind of scenario and its because there are certain conflicting dlls (including MAPI32.dll) between the two applications and since one of them being the updated one, it isn’t compatible with the other and hence Outlook crashes and the next time it loads; it would disable the add-in.
    The solution is simple to have either one of the applications running on the machine as both cannot co-exist.

  3. Ratish Sekhar Says:

    Thank you Nilesh.

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