The RingCentral Scheduler Outlook add-in makes scheduling meetings in Outlook easy. With this Outlook add-in, you can quickly add a meeting to any new or existing calendar event. 
There are two ways users can install this Outlook add-in:
  • Admins can deploy RingCentral Scheduler on behalf of the users. This is useful when you want to deploy RingCentral Scheduler for all your users at once. 
  • Users can also install RingCentral Scheduler add-in to their Outlook instead.
Note: For the purpose of this article, we’ll discuss how admins can deploy RingCentral Scheduler to all users if the add-in store is not available or accessible. If the add-in store is available, however, visit Deploying RingCentral Scheduler Outlook add-in to users using the add-in store from Office 365 admin center.

Deploying for other users with XML file from Office 365 admin center

RingCentral Scheduler can be deployed using the XML file if you do not have access to the Microsoft add-in store.
1. Sign in to Microsoft Office 365 with your administrator account.
2. Navigate to Settings > Service & Add-ins via the left navigation bar.
3. Select Deploy Add-in located at the top of the page.
Select Deploy add-in
4. On the Deploy a new add-in page, click Next.
Start Deploy add-in
5. Click Upload custom apps.
Upload custom apps
6. Select I have a URL for the manifest file, then enter:
Enter URL
7. Click Upload. The add-in is now enabled.
8. In Who has access, select Edit to specify who the add-in is deployed to.
9. On the Edit who has access page, select either Everyone
Select Specific users / groups, then enter the name to search for users.
Configure add-in
10. When finished, click Save.
11. Review the add-in settings, then click Close.
Note: After deployment, Outlook‎ add-ins can take up to 12 hours to become available to your users.