Error when opening an add in in outlook 2013

Get following error when trying to open add in in outlook.


MailStore is unable to open a web page in Microsoft Outlook. The most common reason is functionality blocked by group policies. Error code: CONTROL_NOT_FOUND


If it is a group policy which policy do I need to unblock?
jyoung127Asked:
Who is Participating?
 
Jackie ManConnect With a Mentor Commented:
You need MailStore Server 8.0 for Official Outlook 2013 Support.

What kind of group policy changes you have made?
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Pradeep VIshwakarmaCommented:
Hi,

The problem can be caused by uninstalling Google Chrome or Mozilla Firefox while set as default web browser. To resolve the problem, follow these steps:

   1 Open Regedit in order to modify your system registration.
   2 Browse to HKEY_CURRENT_USER\Software\Classes\.html
   3 Right click the value for the .html key and select Modify
   4 Change the value from ChromeHTML to htmlfile (or from FireFoxHTML to htmlfile)
   5 Repeat these steps for .htm and .shtml keys if they exist. You may also want to check     the .xhtml and .xhtm keys.
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jyoung127Author Commented:
Its not just happening on one pc its happening on multiple computers. I will say that all three browsers are installed.
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Jackie ManCommented:
Which version of MailStore Server?

You might need to update to the latest version of MailStore Server.

http://www.zensoftware.co.uk/mailstore/releasenotes.aspx
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jyoung127Author Commented:
Looks like we are t running an older version. 6.03.6479 it was working last week but we made some group policy changes but I am not sure which policy would cause this error. I agree we might need to upgrade to newest version but that will require a push of software to a lot of users and I might be willing to tackle that down the road but not today.

Any other ideas?
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jyoung127Author Commented:
Alot merging of group policy's. I will check older version of outlook tomorrows if it checks out I will let know thanks.
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jyoung127Author Commented:
Looks like it is not a group policy issues like I thought originally. Tested on older outlook works fine.

Thank you for pointing me in correct direction.
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