TIP#1 : Quickly expand Mail Folder 'groups' to view or hide messages!!

In Outlook, if you have your email messages grouped (for example, the default for your messages are grouped by Today, Yesterday, etc) or if you sort on the sender by clicking the FROM column heading the messages are grouped by the specific sender , you can quickly expand and collapse a specific grouping of messages sent by a specific person by doubleclicking on the group.   This is a toggle on/off – simply doubleclick on the specific group again to collapse.

 Another method of expanding/collapsing the group is to right click on the group and select from the options available. 

Tip #1 - QUICKLY EXPAND MAIL FOLDER 'GROUPS' TO EXPAND OR HIDE MESSAGES!!