Microsoft reluctantly offers another paid lifeline for old Exchange and Skype for Business — but don't get comfy

The U-turn

It has been reported that Microsoft will provide a second, short-lived window of Extended Security Updates (ESU) for Exchange Server 2016/2019 and Skype for Business Server 2015/2019, running from May 2026 to October 2026. The firm had earlier said the ESU program would not be extended past April 2026 — emphatically — yet here we are. Why the change of heart? Because some customers, apparently, still haven't finished migrating.

The product nobody wanted to sell

The new ESU period is paid, and comes with a blunt set of caveats: customers must pay for the service, Microsoft makes no guarantee it will actually release any updates during the short extension, and it warns there will be no further extensions after October. Microsoft reportedly even wrote, with a mix of corporate patience and exasperation, "we'd be happy to not sell Period 2 Exchange ESU to anyone; please migrate instead!" Ouch. Short-term reprieve, long-term deadline.

Why this matters

This is more than a billing headline. Running unsupported messaging infrastructure is a high-risk move — attackers love predictable targets — so the extra time could be a real lifesaver for firms juggling legacy apps, compliance headaches, or frantic migration projects. But it also nudges customers toward clouds and modern stacks, a trend that's been accelerating as enterprises look to reduce on-prem sprawl and operational debt.

The emotional nub

Here's the heart of it: Microsoft doesn't want to be the lifeboat forever, and many customers don't want to abandon boat anchors overnight. The result is a compromise that feels both merciful and mildly chastising — pay us to keep your old kit afloat for a few more months, but actually, please swim to shore. Who knew grief counseling for server admins would include an invoice?

Sources: The Register