Add mailbox to Outlook on Windows
Step-by-step instructions to set up your Microsoft 365 Exchange Online mailbox in Outlook on Windows.
Open Outlook
Start Microsoft Outlook on your Windows computer.
Add account
First time using Outlook? A welcome window appears. Click 'Next' to start the configuration.
Outlook already in use? Go to File > Add Account.
Configure account
Select 'Email account' in the dialog box. Enter your name, email address and password and click 'Next'.
Automatic configuration
Outlook tries to automatically configure your Exchange Online account via the AutoDiscover feature.
Security certificate
A notification about the server certificate may appear. Check 'Always trust this server' and click 'Yes'.
Complete
When configuration is successful, a confirmation message appears. Click 'Finish' to complete the installation.
Manual configuration
Automatic configuration not working? Choose 'Manual setup or additional server types' and click 'Next'. Select 'Microsoft Exchange Server or compatible service' and enter the server address: outlook.office365.com. Go to 'More Settings' > 'Security' tab and make sure 'Use encrypted connection (SSL)' is checked.