Microsoft recommends upgrading on-premises Exchange Server 2013 servers to Exchange Server 2019 to keep receiving bug fixes and security updates for new flaws. However, before deploying new Exchange Server 2019 installations across servers running software quickly reaching EOS, admins should ensure that network, hardware, software, and clients meet the requirements. Redmond also advises admins to migrate to its hosted Exchange Online email and the calendaring client as an alternative option, available as an Office 365 subscription or as a stand-alone service. “If you’re migrating to Exchange Online, you might be eligible to use our Microsoft FastTrack service,” Schnoll said. “FastTrack provides best practices, tools, and resources to make your migration to Exchange Online as seamless as possible. Best of all, you’ll have a support engineer walk you through from planning and design to migrating your last mailbox.” Detailed information on Microsoft 365 migration options and methods is available on Microsoft’s documentation site. Redmond also guides global administrators to help decide the migration path in Exchange Online. Windows 7 also stopped receiving extended security updates for critical vulnerabilities starting Tuesday. Windows 8.1 also reached EOS the same day. Earlier this month, Microsoft reminded Windows admins that the extended support for all editions of Windows Server 2012 and Windows Server 2012 R2 would also end on October 10.
https://www.bleepingcomputer.com/news/security/microsoft-exchange-server-2013-reaches-end-of-support-in-90-days/
