Multiple Accounts Same Folders

Can multiple accounts use the same inbox, deleted, spam folders etc.

Yes but only if they are POP3, and it has to be specified when they are setup. It cannot be changed later.

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If you mean a Unified Inbox, Sent, Spam, Deleted… Yes; No need for POP3 setup.
Right Click on the box where the account tree is add Favorite the Right click on the Favorite and select Inbox…

If its not for Unified inbox… then POP3 is indeed your only option.