Apple mail considerations

1. Basic configuration requirements
Supported Protocols
Exchange Web Services (EWS)
IMAP (limited functionality, not recommended)
Modern Auth (OAuth 2.0) must be enabled.
System version requirements
macOS ≥ 10.15 (Catalina)
Apple Mail ≥ version 14.0
2. Frequently Asked Questions and Fixes
 Unable to add account
Check the authentication method:
Administrator needs to enable “OAuth 2.0” (enabled by default in Exchange Online)
Older Exchange versions need to be enabled manually:
powershell
Set-OrganizationConfig -OAuth2ClientProfileEnabled $true
Manual configuration steps:
Select “Exchange” type (not IMAP)
Enter full email address and password
 Mail synchronization failed
Rebuild the local cache:
Delete ~/Library/Mail/ folder (backup first)
Restart Apple Mail to resynchronize
Limit Sync Cycle:
Settings > Accounts > Mailboxes > Adjust “Mail download days” (recommended ≤ 90 days)
 Calendar/Contacts are not synchronized
Check System Preferences > Internet Accounts
Make sure “Calendar” and “Contacts” options are checked.
4. Advanced Troubleshooting
Testing Connectivity
Use Microsoft Remote Connectivity Analyzer:
Select “Exchange ActiveSync” test
Verify Autodiscover logging
 Viewing Apple Mail Error Logs
Open Console
Filter for “Mail” and “Error” keywords