# Setup
To turn on macOS MDM features, follow the instructions on this page to connect Fleet to Apple Push Notification service (APNs).
To use automatic enrollment (aka zero-touch) features on macOS, follow instructions to connect Fleet with Apple Business Manager (ABM).
To turn on Windows MDM features, head to this [Windows MDM setup article](https://fleetdm.com/guides/windows-mdm-setup).
## Apple Push Notification service (APNs)
Apple uses APNs to authenticate and manage interactions between Fleet and the host.
To connect Fleet to APNs or renew APNs, head to the **Settings > Integrations > Mobile device management (MDM)** page.
> Apple requires that APNs certificates are renewed annually.
> - If your certificate expires, you will have to turn MDM off and back on for all macOS hosts.
> - Be sure to use the same Apple ID from year-to-year. If you don't, you will have to turn MDM off and back on for all macOS hosts.
## Apple Business Manager (ABM)
> Available in Fleet Premium
To connect Fleet to ABM or renew ABM, head to the **Settings > Integrations > Automatic enrollment > Apple Business Manager** page.
After connecting Fleet to ABM, set Fleet to be the MDM for all Macs:
1. Log in to [Apple Business Manager](https://business.apple.com)
2. Click your profile icon in the bottom left
3. Click **Preferences**
4. Click **MDM Server Assignment** and click **Edit** next to **Default Server Assignment**.
5. Switch **Mac** to Fleet.
New or wiped macOS hosts that are in ABM, before they've been set up, appear in Fleet with **MDM status** set to "Pending".
All hosts that automatically enroll will be assigned to the default team. If no default team is set, then the host will be placed in "No team".
> A host can be transferred to a new (not default) team before it enrolls. In the Fleet UI, you can do this under **Settings** > **Teams**.