The firewall is set to allow Outlook inbound and outbound. The autodiscover record is configured correctly at DNS. Log back on as User1 Follow the same steps again Outlook fails to find the Exchange server again. This is documented in the following article: Preparing for TLS 1.2 in Office 365 and Office 365 GCC - Microsoft 365 Compliance | Microsoft DocsĪdditionally, there were recent changes to the minimum required version of Office to connect to Microsoft 365 Mailboxes. Follow the same outlook configuration steps as before. TLS 1.2 should be enabled on all devices connecting to Microsoft 365 mailboxes. Registry location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client Registry location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp Registry location for 圆4-based computers: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp Registry location for x86-based computers: Several things can cause Outlook not to connect to Office 365. Operating System updates mentioned on the article should be installed, and the following registry keys should exist: If you're an admin with multiple users reporting problems, you also should check for service issues with Microsoft 365. Outlook on Windows 7 and legacy Windows versions stop connecting to Microsoft 365 mailboxes.Īfter investigating the issue, most cases have been resolved by enabling TLS 1.2 on the Operating System per, Update to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP in Windows Fix software update and profile issues Out-of-date software and corrupted Outlook profiles are two of the most common issues that can prevent you from sending and receiving email.
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