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If your Outlook won’t open the MyDesk add-in and gives the error message “You need a new app to open this about link, it’s due to a policy on your end that blocks the action that the add-in uses to log you in.
To solve this, your IT department needs to replace your current addin with this one: https://outlookaddin.mydesk.io/manifest.prod.legacy.xml
It should then work within 6 hours. If it still doesn’t work, you need to delete Cache in Outlook. You can read more about this here.
