Microsoft to bounce mail from outdated Exchange servers
2016 and 2019 installations must meet the October 2025 baseline to reach cloud-hosted inboxes
Microsoft is upping the ante on Exchange Server security, warning that outdated on-premises systems will soon be blocked from sending email to Exchange Online.
From the second week of September, Exchange Server 2016 and 2019 machines that send email to Exchange Online through an inbound connector of the OnPremises type must be patched to the final public update baseline released in October 2025, according to Microsoft.
"This update level was released almost a year ago," Microsoft stated, "and all organizations should have updated to it."
Microsoft has been advancing its "oldest acceptable version" for some time, but this change takes the baseline to the final public update for Exchange 2016 and 2019. Any subsequent increase would leave only customers enrolled in the Extended Security Update (ESU) program or those who have migrated to Exchange Server...
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