-- The Azure File Sync agent installation package is specific to the operating system version. If you're upgrading a server to a newer version of Windows Server, you must first uninstall the Azure File Sync agent and restart the server.***Do not unregister the server and re-register server during OS upgrade, or it will lead to orphaned tiered files on existing server endpoints.*** Then, upgrade the operating system to the new version. After the upgrade is complete, install the Azure File Sync agent that matches the new Windows Server version such as 2016, 2019, 2022, or 2025. After installing the agent on the upgraded server, the Azure portal should reflect the correct server status within 30 minutes.
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