Error: The Add-in cannot be loaded by Outlook

Posted by Dave Mellors | Filed under Fixes to problems

After uninstalling Symantec Anti-virus I found that when I started Outlook 2007 it came up with the following error:



The Add-in “Symantec AntiVirus 10.1″ (c:\program files(x86)\Symantec Antivirus\vpnsece4.dll) cannot be loaded by Outlook. Please contact the Add-in manufacturer for an update. If no update is available please uninstall the Add-in.


The problem was that the addin didn’t appear in Tool->Trust Center->Add-ins so I couldn’t uninstall it from there.


Fortunately, deleting the file extend.dat from c:\users\<User Name>\AppData\Local\Microsoft\Outlook and restarting Outlook done the trick. That was obvious - NOT!!


NOTE: I am running Vista x64 so if your running a different version of Windows the file is likely to be located elsewhere. Possibly C:\Documents and Settings\<User Name>\Local Settings\Application Data\Microsoft\Outlook

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Permalink | 9 Comments » | May 29, 2008

9 Responses to “Error: The Add-in cannot be loaded by Outlook”

  1. B.I.G. DS Says:
    August 4th, 2008 at 2:17 am

    worked for me too.

    have you experienced any negative side effects after deleteing?

    so far so good for me.

    THANKS!

  2. Dave Mellors Says:
    August 4th, 2008 at 5:48 am

    No side effects. The extend.dat file contains cache information and just gets rebuilt when you start Outlook.

    Thanks for letting me know the post helped you.

  3. Mark Says:
    August 12th, 2008 at 3:56 pm

    Did a Google search for this add-in issue and your post about deleting the extend.dat file did the trick for my 25 users.

    Thanks!

    Mark

    Mark Cefaly
    Manager, Information Services
    Maryland Crime Victims’ Resource Center

  4. D.Z. Says:
    August 19th, 2008 at 10:18 pm

    It did the work. No negtive side effect. Thanks a lot

  5. IRCD Says:
    September 15th, 2008 at 3:34 pm

    Worked for me too.
    Many thanks

  6. RD Says:
    September 16th, 2008 at 8:19 pm

    Thanks! your post helped me as well get from that annoying message….
    Take care
    Ronen

  7. Happy ESET NOD32 user Says:
    October 8th, 2008 at 4:49 am

    Typical of Symantec uninstalls. You’d almost think they didn’t want to make it easy for you to migrate to a different AV product :)

  8. Ron Says:
    October 11th, 2008 at 5:25 am

    Worked for me too in XP

  9. ICD Says:
    October 29th, 2008 at 9:19 pm

    Worked for me, too… with F-Prot

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