Exchange Server Unavailable

Stuck on the "Exchange Server Unavailable" message? Learn the common causes, from DNS glitches to corrupt OST files, and find practical fixes to get reconnected.

When Outlook reports that the Exchange Server is unavailable, it prevents access to your emails and calendar. This common problem can arise due to various factors including unstable internet, DNS cache issues, firewall blocks, server-side problems, or even faulty Outlook add-ins and misconfigured profiles. If you're encountering this connection error, understanding the potential causes is the first step. This resource explores these reasons in detail and offers multiple solutions, including checking services, reconstructing Outlook profiles, and modifying registry settings, to help you re-establish the connection.