Hi @Terry Seagert ,
it depends on where is your mailbox hosted.
Most of the providers are offering a web access for the mailbox. This way you are able to login to your mailbox via web browser (requires an internet connection).
That is the easiest way to access your mail box and folders.
Exporting the folders in a pst file might be an option. But this requires a PST reader app on your notebook and tablet. You can use one of the internet search engines to find "PST Reader" apps.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)