With the re-push of Windows 10 October 2018 updates, Microsoft has also re-released the version of Windows Server 2019/1809. Users can download Windows Server 2019 from the bulk authorization service center.
Azure users will see Windows Server 2019 mirror selection in the next few weeks, and Microsoft Evaluation Center will soon release the evaluation version of Windows Server 2019. Re-release of Windows Server 2019 means that Exchange Server 2019 can also be deployed, as Windows Server 2019 version is required.
Microsoft will adjust Windows support time according to the time of re-release, including Semi-Annual Channel and Long-Term Servicing Channel, starting on November 13.