You can also move an individual email to the Archive folder by pressing the Backspace key when the message is highlighted or when you’re reading it. (Select multiple messages by holding down the Ctrl key and clicking each one you want to select.) With the message or messages selected, go to the Ribbon’s Home tab and click Archive in the Delete group, right-click the message or group of messages, and select Archive, or simply drag the selected message(s) to the Archive folder. To move messages to the Archive folder, first select one or more that you want to archive.
And even if you do have a folder system, you might find that not all of your email fits neatly into your folders and subfolders you can move these messages to the Archive folder to keep your inbox clean.
If you already have a system of folders and subfolders in Outlook, you might not need the Archive folder, but it can be a boon for those of us who tend to leave everything in the inbox. Microsoft recommends that you use the Archive folder to store messages that you’ve already responded to or acted on. Using the Archive folder doesn’t reduce the size of your mailbox it simply helps tidy up your inbox while keeping older messages instantly accessible. That way, when looking for a message, you can browse or search the Archive folder and find the message more quickly. There’s another option in Outlook 2019: You can move specific pieces of mail out of your Inbox or other folders and into the Archive folder. You can still get them back, but it takes some doing. These methods remove the messages from the user’s Outlook mailbox. Corporate versions of Office offer their own archiving features that automatically archive users’ older messages, again to save space. Outlook has long offered email message archiving - that is, the option to move messages out of your Outlook mailbox and into a separate PST file as a space-saving measure. Of 2 Stash messages in the Archive folder in Outlook 2019