Prevent users from using the "Send to OneNote" add-in from copying data from a corporate account email account to a personal OneNote account
The "Send to OneNote" add-in is enabled/disabled though the users' Exchange mailbox, users of Office 365 enterprise accounts can see their Exchange add-ins by going to https://outlook.office.com/owa/?path=/options/manageapps. When the OneNote add-in is added to a user's Exchange account the button shows up in Outlook on the desktop, Outlook mobile (Android & iOS), and Outlook on the web. Users' can access the "Send to OneNote" functionality on mobile by opening an email, clicking on the vertical ellipses on the e-mail, then clicking the "Send to OneNote" button. If the user has never logged into the OneNote add-in they will be asked to log in, from here the user can choose to enter their corporate Office 365 credentials or personal Office 365 credentials. If the user chooses to enter their personal Office 365 credentials their personal OneNote notebooks are displayed, they are free to select which notebook they want to copy the email to. This is an issue because the "Send to OneNote" functionality doesn't honor Mobile Application Management (MAM) policies that govern the Outlook mobile app. Picture a scenario where an enterprise is using Outlook Mobile with MAM polices applied and has an expectation that users cannot copy and paste corporate data outside of the Outlook Mobile app. Effectively, this allows a person to take a corporate email and move that information outside of their organization to their personal OneNote account.