SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.

GNU General Public License v2.0

sogo

Quickly create responsive HTML emails that work on any device and client. Even Outlook.

MIT License

foundation-emails

react-big-calendar

Outlook add-in companion to report suspicious mail easily

GNU General Public License v3.0

NotifySecurity

A basic flask based Outlook Web Honey pot

Apache License 2.0

owa-honeypot

:calendar: A GitHub action to create Outlook calendar event using Microsoft Graph

sogo

foundation-emails

react-big-calendar

NotifySecurity

owa-honeypot

ms-graph-create-event