When you need as much space as possible on the screen to view messages, events, or contacts in your Outlook, you can collapse (or minimize) the Ribbon and then restore it quickly.

The default settings minimize Outlook to the Taskbar, but you can make settings to minimize it to the Tray.

In Outlook for Microsoft 365 you wouldn't find a distribution list because it's called now Contact Groups, for more details see Sharing contact groups in Outlook.

When you open an e-mail, it automatically is marked as read. However, if you are using the Reading Pane to view messages instead of opening them, you have a number of possible options for marking e-mails as being read.

In Outlook for Microsoft 365 Options, the options Notes and Journal is removed. New notes have a default color of yellow, default size of medium, default font of 11 point Calibri, and display the date and time that the note was last modified.
These options are not read and cannot be changed from any preferences or registry keys.

In Outlook for Microsoft 365 Options, the options Notes and Journal is removed. New notes have a default color of yellow, default size of medium, default font of 11 point Calibri, and display the date and time that the note was last modified.
These options are not read and cannot be changed from any preferences or registry keys.

Suppose you'd like to add a couple more commands to the Quick Access toolbar. Also, say you want to work with every e-mail in new window. You can add the Open in New Window button to the Quick Access toolbar.

To turn on/off a rule, follow next steps:

Outlook proposes next shortcut keys for easy and quickly work with Calendar:

If your Microsoft Exchange account has strict size limits, it fills very quickly by replies and forwards of emails with attachments. When your Outlook mailbox fills up, you cannot receive new emails without removing old ones. To prevent your inbox from filling up and still keep the conversation's history, you can move old items to a separate Outlook Data File (an archive.pst). You can archive emails manually or use the AutoArchive feature in Outlook that moves old entities to an archive automatically. You can customize the AutoArchive schedule and behavior for a more comfortable Outlook experience.