• microsofts enterprise email system. basically Outlook’s backend
    • stores user mailboxes, exposes mail protocols (MAPI/HTTP, Outlook on the web, activeSync, SMTP), routes mail and integrates with AD really neatly
  • distribution groups are used to send mails
    • instead of sending a mail to 50 specific users. you simply send a mail to for example skibidi@company.com which is a distribution group in the backend which exchange resolves and sends the mail to every user in the group