The Spreadly Outlook Add-In allows admins to centrally manage email signatures and automatically distribute them to all users. This saves time, reduces complexity for employees, and eliminates outdated email signatures. This guide explains how to install the Spreadly Add-In for Microsoft 365. More information about the email signature software can be found here: https://spreadly.app/en/email-signatures

1) Download the Add-In

You can download the Add-In as an Add-In Only Manifest from "Team > Email signatures > Install Outlook Add-in" at https://spreadly.app/app/team/email-signatures.

Please note: The Add-in is provided as an XML file. Microsoft checks the file during upload for security and compliance.

2) Install Unified App

Open the Microsoft 365 Admin Center and go to Settings > Integrated apps.

In the displayed dialog, select App Type as "Office Add-in" and tick "Upload manifest file (.xml) from device". Then, click Choose File to upload your previously downloaded .xml file.

3) Select target users

After uploading the app and confirming the configuration, you can select the group of users who will have access to the plugin later. We recommend initially making the app available only to specific test users. You can change the targeted users at any time for a global rollout.

4) Review and accept permissions

Our add-in requires admin approval to automatically authenticate your users with Spreadly. As an admin, you’ll need to review and approve the permission request for your organization. Click "Accept permission" to verify this.

5) Review and finish

Once the permissions are approved, the deployment is complete and ready for review. The deployment of the Add-in can take up to 72 hours. In case the add-in is not visible in Outlook after restarting after the 72 hours, check you've deployed it to the correct users or get in touch with us.

FAQ

The Spreadly Outlook Add-In is not visible for me or an other user.

After added the Outlook Add-In to the integrated app section, it can take up to 72 hours for the Add-In to be distributed and activated in all Outlook clients. If you have waited the given time, check on the assigned users of the app if the account is selected here or ensure he is part of the selected groups in case you have not selected "Entire organization". Also please consider that changes to the assigned users can take up to 72 hours as well to be effective.

Updated on: 28/10/2026