Exchange 2016 and 2019 Security Updates End With ESU in October 2026: What to Check This Month If you still run Exchange Server 2016 or 2019 on premises, Microsoft’s own September 2026 update notes contain a date... Sep 26, 2026 5 min read Exchange
Exchange Online Starts Blocking EWS on October 1, 2026: How to Check Your Exposure and Buy Time With EwsAllowedAppIDs October 1, 2026 is when Microsoft starts disabling Exchange Web Services access by default across Exchange Online tenants. If your... Sep 25, 2026 5 min read Exchange
Exchange Online Is Now Throttling and Blocking Outdated Exchange 2016/2019 Hybrid Servers: Are You Below Baseline? Since the second week of September 2026, Exchange Online has been actively throttling and, eventually, blocking mail from Exchange 2016... Sep 24, 2026 5 min read Exchange
September 2026 Exchange Server Security Updates (KB5121608): Three Vulnerabilities Worth Patching Now Microsoft’s September 2026 Exchange Server security updates (KB5121608) address nine vulnerabilities, three of them serious enough that any Exchange admin... Sep 23, 2026 5 min read Exchange
September 2026 Patch Tuesday: What Windows Server, Active Directory, and Exchange Admins Need to Patch Right Now Microsoft’s September 2026 Patch Tuesday is the largest release in the program’s history: 974 CVEs addressed in a single month,... Sep 15, 2026 6 min read Active Directory / Exchange / Security
How to Investigate a Compromised Exchange Server: A Practical Incident Response Checklist (Exchange 2016/2019) The exact checklist for triaging a suspected Exchange compromise: web shell locations, IIS log indicators, mailbox export/permission abuse, transport rule tampering, and what to preserve before remediating. Sep 6, 2026 4 min read Exchange / Security
September 2025 Exchange Server Hotfix Updates: Features, Fixes, and Installation Guide On September 8, 2025, Microsoft released new Hotfix Updates (HUs) for Microsoft Exchange Server. These updates primarily include fixes for... Dec 14, 2025 4 min read Exchange / Microsoft / Windows Server
Step-by-Step Upgrading to Exchange Server Subscription Edition (SE) Microsoft officially released the Exchange Server Subscription Edition RTM (KB5047155) on July 1, 2025. Also known as Exchange Server SE,... Dec 14, 2025 3 min read Exchange / Microsoft / Windows Server
Ultimate Guide to Offboarding Users in MS365 When someone leaves your company, taking care of their digital footprint is a priority. You need to make sure their... Dec 14, 2025 7 min read Azure / Cloud Computing / Exchange / Microsoft
Exchange Server 2016/2019 end of support Exchange Server 2016 and Exchange Server 2019 reached end of support on October 14, 2025. That date matters more than... Dec 14, 2025 3 min read Exchange / Microsoft
