Install MailRisk in Office 365
Go to https://admin.microsoft.com and login with your administrator account.
Below the cog-icon in the menu (Settings), find «Integrated apps».
Click the «Upload custom apps» link in the header navigation:
![Location of the Upload custom apps button in Office 365.](/img/asset/aW1hZ2VzL2d1aWRlcy9pbnN0YWxsLW8zNjUtc3RlcDAucG5n/install-o365-step0.png?w=1024&h=446.09900990099&fit=crop&q=85&s=21efa4cbc110692f17628bec5232358b)
In the next step, click «Choose file» (or equivalent) to upload from your device.
![Office 365 upload file screen.](/img/asset/aW1hZ2VzL2d1aWRlcy9pbnN0YWxsLW8zNjUtc3RlcDEucG5n/install-o365-step1.png?w=1024&h=709.56199304751&fit=crop&q=85&s=ca12e7305bb480ed8ccfc1dd70149783)
The above step requires you to upload an XML manifest file, which describes the MailRisk add-in to Exchange and Outlook, from your local hard drive.
To obtain the required manifest-file, go to the Secure Practice customer portal https://manage.securepractice.co, and click «Download manifest.xml».
After uploading, click «Next» to continue.
![Screenshot of adding new users.](/img/asset/aW1hZ2VzL2d1aWRlcy9pbnN0YWxsLW8zNjUtc3RlcDIucG5n/install-o365-step2.png?w=1024&h=695.76523702032&fit=crop&q=85&s=500836f3e104a1472c46205d492c0ffe)
To activate the button immediately for everyone in your organization, select «Entire organization» in the assign users section.
It is also possible to distribute the button to a limited group of users.
Instead, select «Specific users/groups» and add users and/or groups to access the add-in.
Validate the installation by reviewing App Permissions.
Click «Next» to accept.
![Screenshot of the app permissions request.](/img/asset/aW1hZ2VzL2d1aWRlcy9pbnN0YWxsLW8zNjUtc3RlcDMucG5n/install-o365-step3.png?w=1024&h=519.78378378378&fit=crop&q=85&s=21ecb22e5624d43cf53852aff88de040)
Finally, complete this guide by clicking «Finish deployment»
![Final deployment screen.](/img/asset/aW1hZ2VzL2d1aWRlcy9pbnN0YWxsLW8zNjUtc3RlcDQucG5n/install-o365-step4.png?w=1024&h=541.53846153846&fit=crop&q=85&s=d168dd86d554ae1fbcf0d73ffeed2ea2)