What is MS Outlook? MS Outlook is the preferred email client used to send & receive emails. Outlook also provides access contact, email calendar & task management features. Outlook can be used as a standalone personal email software, & business customers can use Outlook as multiuser software. Users can integrate it with Microsoft Share Point to share documents & project notes, collaborate with colleagues, send reminders & more. What's new in MS Outlook 2021? Outlook 2021 for Windows.. .