Email not syncing: first checks

Reference only. Follow your organization's IT policies and change process. Each step links its official vendor source.

Windows

1. Scope: One mailbox or everyone? Webmail working?
2. Network: Is the internet working on this device? ping <default gateway> If the network fails, fix that first. source
3. Service: Can you reach the mail service port? Test-NetConnection outlook.office365.com -Port 443 Failed = network/proxy/firewall, not the mailbox. source
4. Vendor guide: Microsoft: Fix Outlook connection problems source

Mac

1. Vendor guide: Apple: If you can't send or receive email on Mac (status icons, webmail test, re-add account) source

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