Microsoft’s Office 365 feature will allow users who subscribe to one of the company’s high-end enterprise hosting plans to send encrypted email messages. The optional feature will work with Exchange Server, Outlook.com, Gmail, Yahoo, Lotus Notes, GroupWise, and Squirrel Mail. Encrypted message recipients will see an encrypted message attachment in their email, which when double-clicked will open in a browser window. The data contained in the encrypted message is stored in Microsoft’s datacenter using BitLocker disk-level encryption.”]
Source: https://www.darkreading.com/application-security/microsoft-office-365-encrypted-email-on-tap