Is there a ELI5 (explain like I'm 5) for this process? I'm not looking for a software recommendation.
I searched offline storage table (OST) and read that it "is an offline Outlook Data File used by Microsoft Exchange Server that enables users to work with their messages and mail data even when access to the mail server isn't available." I also read a lot of content about OST and PST software.
Why would a person work with their messages and mail data even when they can't access a server? What kind of work is a person doing that this is even necessary to do offline?