Definition
Exchange Autodiscover helps compatible clients locate their mailbox connection settings automatically.
How it works
Depending on client and platform, discovery uses DNS, HTTPS endpoints and secure redirection mechanisms. Incorrect records can cause repeated prompts or connections to retired servers.
Real-world example
Following an Exchange Online migration, Outlook may continue using obsolete discovery information even when the mailbox itself works.
Limits and best practices
Check DNS records, certificates, redirects and client connectivity diagnostics. Avoid untrusted redirects that might expose credentials.
Technical detail to remember
After Exchange migration, stale Autodiscover records or redirects can cause repeated Outlook prompts. Examine DNS, certificates, discovery methods and sign-in logs before recreating user profiles.