1. Log in to the CRM and from the sidebar, navigate to Settings → CRM Settings.
2. Click on Module Management → Modules.
3. Click on Import Module from ZIP to install the Microsoft OAuth ZIP package.
4. Select the checkbox, choose the ZIP file from the system, and click Import to proceed with installation.
5. A message appears stating that MailManager already exists. Click Update Now to complete the installation. After this step, MailManager is updated in the CRM.