Microsoft Introduces Exchange Server Subscription Edition: A Shift in Lifecycle Policy
This month, Microsoft unveiled the Exchange Server Subscription Edition (SE), marking a significant shift towards the Modern Lifecycle Policy. Under this approach, the software will receive continuous updates without an end-of-life designation, provided that users keep their systems current. Alongside this announcement, Microsoft also shared unexpected news regarding increased Extended Security Updates (ESUs) for both Exchange 2016 and 2019. With the company winding down support for older versions, it has expressed frustration regarding the continued use of unsupported versions of Exchange by some customers.
Changes in Migration Tools for Legacy Systems
As detailed in a recent Microsoft blog post, the company previously provided migration tools for transferring public folders from on-premises Exchange 2013 and earlier versions to Exchange Online. However, Microsoft is reevaluating its position on this issue.
Upcoming Deadline for Migration from Older Exchange Versions
Beginning October 1, 2025, users of Exchange 2010 and earlier versions will no longer have access to Microsoft’s migration tools for moving public folders to Exchange Online. This change aims to decrease dependency on legacy systems and enhance “long-term service reliability.”
Critical Action Required for Users
Any migration attempts made after the deadline will be unsuccessful. Microsoft strongly advises customers to begin their migration processes urgently. To transition to Exchange Online after October 1, users must first upgrade to Exchange 2013 or later. It is crucial to note, however, that only Exchange versions 2016 and 2019 are currently supported.
Strong Recommendations from Microsoft
In a firm statement, Microsoft reiterated its stance against the use of unsupported Exchange Server versions. This advisory comes in light of ongoing public folder migrations from legacy systems, which the company believes should not be taking place at this point. Customers are urged to upgrade promptly to Exchange Server 2016 or 2019, but ideally, they should look to switch to Exchange Server SE, especially considering the impending end of support for the other two versions.
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