Following are the most widely used admin roles in Office 365 with their description.
| Role | Description |
|---|---|
| Global administrator | It is by default a user who signs up to buy 0365 services. The global administrator can access all administrative features and It is the only user who assigns admin roles to other users. |
| Billing administrator | Billing administrator makes organization purchases, manages subscriptions and support tickets, and monitors service health. |
| Exchange administrator | Exchange administrator manages mailboxes and anti-spam policies for your business. |
| SharePoint administrator | SharePoint administrator manages the document storage in SharePoint Online. They can also designate another user as site collection administrator. |
| Password administrator | Reset passwords for normal users, manages service requests, and monitors service health. |
| Skype for Business administrator | Skype for Business administrator configures Skype for Business for the organization. |
| Compliance administrator | Compliance administrator have access to Office 365 admin center, security and compliance center, exchange online admin center, and the Azure AD Admin Portal. |
| Service administrator | Service administrator role has "view-only" permissions except he/she can open support tickets and reads them. |
| User management administrator | User management administrator can reset the password for users (only users and not admin), monitors service health, adds and deletes user accounts, and manages service requests. |