Disable Office 365 calendar integration

[#1]

We do not want our users to utilize this functionality because it creates a security risk for our company. We would like to globally remove the "Add account" options in the Calendar settings of the home view.

[#2]

Our company does not offer cloud Office but regular users do not understand this so they go in to "Add Account" and enter their production credentials (agree with Jason, this is a security risk).