This guide explains how Microsoft 365 administrators can deploy the Filemail Outlook Add-in to users in their organization using the Microsoft 365 Admin Center.
Prerequisites
Before you begin, ensure that:
You have Microsoft 365 Administrator permissions.
Users have access to Microsoft Outlook.
Your organization has an active Filemail account if required by your deployment.
Step 1: Open the add-ins management page
Sign in to the Microsoft 365 Admin Center.
Navigate to Settings → Integrated apps (or Add-ins, depending on your Microsoft 365 version).
You will see the list of currently deployed add-ins.
Step 2: Start a new deployment
Click Deploy Add-In.
The Deploy a new add-in wizard opens.
Click Next.
Step 3: Choose deployment source
You will be presented with two options:
Choose from the Store – Deploy an add-in available in Microsoft's AppSource catalog.
Upload custom apps – Upload a custom add-in package.
For Filemail, click Choose from the Store.
Step 4: Search for Filemail
In the search field, type Filemail.
Locate Filemail in the search results.
The Filemail add-in description appears similar to:
Encrypt and send attachments via Filemail
Click Add.
Step 5: Accept the Terms
A dialog will appear displaying the Filemail license terms and privacy policy.
Review the information.
Click Continue to proceed.
Steps 6 & 7: Configure user access & select a deployment method
The Configure add-in page allows you to choose who receives the add-in.
Assign Users
Select one of the following options:
Everyone - deploy Filemail to all users in your Microsoft 365 tenant;
Specific users / groups - deploy Filemail only to selected users or Microsoft 365 groups;
Just me - deploy Filemail only to your own account for testing purposes.
Choose how the add-in will be made available:
Fixed (Default, Recommended for organization-wide deployments) - automatically installed for assigned users, users cannot remove the add-in;
Available - add-in appears in the organization's managed add-ins catalog, sers can choose to install it themselves;
Optional - automatically installed, users can remove it if they do not wish to use it.
Step 8: Deploy the add-in
Review your settings.
Click Deploy.
Microsoft 365 will begin distributing the Filemail add-in to the selected users.
Step 9: Verify installation
After deployment:
Open Microsoft Outlook (desktop or web).
Create a new email message.
Look for the Filemail button in the Outlook ribbon or message compose window.
If the add-in does not appear immediately, allow some time for Microsoft 365 synchronization. Deployment can take from a few minutes up to several hours depending on your Microsoft 365 environment.
Once deployment is complete, end users can begin with Filemail Outlook Add-in: Getting started.
Troubleshooting
Filemail does not appear in search results
Verify that your Microsoft 365 tenant has access to AppSource add-ins.
Confirm you are signed in with an administrator account.
Users do not see the add-in
Verify they are included in the assigned user scope.
Allow additional time for Microsoft 365 replication.
Ask users to restart Outlook or refresh Outlook on the web.
Deployment fails
Ensure your account has the required Microsoft 365 administrative permissions.
Check Microsoft 365 service health for any ongoing issues.
For user-facing configuration questions, see Filemail Outlook Add-in: Settings and Filemail Outlook Add-in: FAQ.
Result
Once deployment is complete, users can securely send large files directly from Outlook using the Filemail add-in, without relying on traditional email attachment size limits.