
Under this policy, Microsoft just has to give organizations 30 days advance notice "when customers are required to take action" to avoid a "significant product degradation." Microsoft just has to give 12 months advance notice when it plans to end support. The next Exchange Server will be offered via a subscription only, and it'll follow Microsoft's Modern Lifecycle Policy. The next Exchange Server product is planned for release in "the second half of 2025." And Microsoft will be altering the terms of the deal when it arrives. The attacks were carried out by a "Hafnium" group, identified as China-affiliated attackers by Microsoft. The vulnerabilities in those Exchange Servers were leveraged for an Exchange Online e-mail exfiltration campaign, instigated for espionage purposes. Such problems dogged the Exchange teams throughout 2021.

Microsoft's hiatus in communications about the development and planned release of the next Exchange Server was due, in part, to the necessity of plugging zero-day holes in existing Exchange Server products.

The Exchange Server team did later promise to "share details in 2022" on the next Exchange Server product, and the Thursday announcement offered lots of details.

Those two products were released in that way, but Microsoft went largely mute on its next Exchange Server release plans after its initial announcement about the Subscription Edition shift, which happened back in October 2020. Like SharePoint Server and Project Server, the next Exchange Server release was slated to follow a "Subscription Edition"' model. Microsoft on Thursday cleared up the mystery surrounding its next Exchange Server release plans, as described in an "Exchange Server Roadmap Update" announcement.
