extended security update

Microsoft’s Exchange engineering team has told administrators there are no security updates for on‑premises Exchange Server this month — an explicit, scheduled announcement that matters because a subset of customers remain on the vendor’s short, paid Extended Security Update (ESU) runway that...

Microsoft published the February 2026 Security Updates for Exchange Server and again urged administrators to apply them immediately — the rollup covers Exchange Server Subscription Edition (SE) RTM and, under Microsoft’s paid Extended Security Update (ESU) program, specific builds of Exchange...