The new Outlook was developed under the code name Monarch and is ultimately supposed to primarily create a merger of the different development lines and also user interfaces. Specifically, this means that the new Outlook for Windows is quite reminiscent of the previous web version of the Office package's central administration tool.
Integration Microsoft Loo
Find and attach important documents simply and quickly
Intelligent assistance helps you stay on top of what’s important
Use your inbox as your To Do list
A new calendar view that can be as unique as you
Staying in control of your inbox and your time is key in a hybrid environment. The new Outlook is a flexible workspace which you can tailor to your work style and connects you across Microsoft 365
Pinning items to make it easier to stay in control
Keep Your Outlook Tidy!
The new Outlook for Windows is available to Beta Channel users running Version 2205 (Build 15225.20000) or later.
The preview of the new Outlook for Windows is available for commercial and education customers in Beta Channel. Some features are not yet supported in the preview like support for Microsoft Accounts (Outlook.com), to learn more about this please read this.