A small business recently migrated to Office 365 and the users were complaining about the Bing Maps and Actions links under the message header in many messages.
These are Outlook apps, currently available only on Office 365 if using Outlook 2013/2016. (They will be coming to Outlook.com sometime this spring.)
The users felt the apps were just a waste of space as they didn’t need Bing maps or the other default apps.
The apps can be turned off globally, for all accounts, in the Exchange Admin Center. Click the apps link (under Organization heading) then double click on the app you wish to disable (or select it and click the Edit (pencil) button). Change the user defaults or uncheck the box to Make this app available to users in your organization.
Users can turn the apps off (or on) in their own account by logging into Outlook Web Access (OWA), then select Gear, Manage apps.
Select an app and click Disable (on the right) to remove the app from Outlook and OWA. It can take 15 minutes or more for the change to sync to Outlook; if you restart Outlook the apps should be removed immediately.
The webpage for Small Business users is slightly different. It has a column called Turned On and checkboxes instead of the Disable link.