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