If you are the Microsoft 365 Administrator
As your company's Microsoft administrator, you can install the Mobile Locker Outlook app for your whole company, groups, or individual users.
Go to the Integrated Apps section of the Microsoft 365 admin center:
https://admin.microsoft.com/#/Settings/IntegratedApps
Click Get Apps.
Search for mobile locker, then click Get it now.
Click Get it now.
Step through the Deploy New App process, making the app available to your Mobile Locker users.
Decide who should be able to use the app.
Accept permission requests.
Review and finish deployment.