Just more ramblings of another IT Guy

Kaspersky Anti-Spam mcou.dll error in Outlook


If Kaspersky is installed with Outlook already open and running it may cause issues with the Anti-Spam/Virus functions.


The following error may be encountered at when Outllook is launched and when the user views an email.

“The Add-in "Kaspersky Mail Checker" (C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 7.0\mcou.dll) cannot be loaded and has been disabled by Outlook. Please contact the Add-in manufacturer for an update. If not update is available, please uninstall the Add-in.”


Solution provided by Kaspersky at the following:




1. Close Microsoft Outlook.

2. Go to Start > Run

3. in the open window enter

regsvr32 -u <"full_path_to_Anti-Virus_setup_folder>\mcou.dll".

For example, for the application Kaspersky Internet Security 6.0, installed to the setup folder the path will look the following way: regsvr32 -u "C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\mcou.dll".

4. Click OK.

5. Open the same window and enter

regsvr32 <"full_path_to_Anti-Virus_setup_folder>\mcou.dll"

Unlike the previous line the “-u” parameter is missing in this line.

6. Click OK.

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2 Responses to Kaspersky Anti-Spam mcou.dll error in Outlook

  1. Utpol says:

    “5. Open the same window and enter”

    Do you mean go to Start>Run?


  2. Ch_int says:

    Thank you very much, fixed the problem……!!!

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