Log in to Microsoft Office 365 Go to the Users tab, then select Active Users Click on the Active Directory Synchronization link above the user list Click on the activate button over the selected user from the list, a notification should pop up Now, click on the Download button and install the Directory Sync Tool Follow the installation setup and click on Start Configuration Now and then Finish After logging in, click on Hybrid Deployment, after that mark the Enable Password Sync checkbox and click on Next. Wait for the configuration setup and then mark the Synchronize your Directories Now checkbox and finish the setup.