Real-world solutions for system administrators
Practical guides and troubleshooting for Microsoft Exchange environments.
Mail flow issues, certificate problems, database mounting errors, Autodiscover failures, SMTP configuration, hybrid setups, and real-world PowerShell scripts used for administration, diagnostics, and automation.
Focused on keeping Exchange stable, maintainable, and operational in production.
The Problem A shared mailbox used by several departments turned up almost empty. The owner opened it in OWA and found two messages where there used to be months of correspondence. Nobody admitted to deleting anything, and the deleted item … cat full-post.md →
Last updated: May 20, 2026 ⚠️ Update May 20, 2026: If images are broken in classic Outlook desktop (not OWA) — this is a separate Microsoft bug introduced in build 19929.20164+, unrelated to EEMS. See the Outlook Desktop Bug section … cat full-post.md →
The Problem You are upgrading Exchange 2016 to CU23 and the installer keeps failing at “Mailbox role: Client Access service” with errors like these: Or: Every time you fix one error and re-run Setup, it fails on a different virtual … cat full-post.md →
The Problem One morning users start complaining they cannot access OWA. Outlook shows “Trying to connect…” and never connects. You open the browser and see: Or worse: an ERR_TOO_MANY_REDIRECTS loop that never stops. You RDP into the server. All Exchange … cat full-post.md →
Full Error When trying to log in to Outlook Web App (OWA), users may see the following error: What This Error Can Mean This error is not always caused by a single issue. In general, it may be related to: … cat full-post.md →
In enterprise environments, phishing campaigns can impact hundreds or thousands of mailboxes within minutes. Once malicious emails are delivered, administrators must respond quickly and remove them centrally. This article presents a production-ready PowerShell script designed for bulk phishing email removal … cat full-post.md →
Faced the following issue A user reported that emails were sent successfully, but Gmail recipients never received them. There were no visible errors in Outlook, however mail flow logs showed the following rejection: Cause The email was sent: Example: Gmail … cat full-post.md →
SSL certificates on legacy infrastructure like Exchange Server 2010 often become a problem at the worst possible moment — when users start seeing “Not Secure” warnings in Outlook Web App (OWA) or mail flow begins to fail due to an … cat full-post.md →