Apple Mail and Microsoft Outlook both are two most preferred email clients for a Mac machine. Apple mail is default with Mac whereas MS Outlook comes with MS office.
Apple Mail: Apple mail is having the most easy-to-use interface with lots of special inbuilt features. With the support for multiple POP, IMAP, Exchange, and iCloud accounts, versatile mail filters, and a smart conversation view, Apple mail is good enough for required needs. In Apple mail all mail folders are saved separately with the extension of ".mbox" example inbox.mbox, outbox.mbox, drafts.mbox etc.
Apple Mail: Apple mail is having the most easy-to-use interface with lots of special inbuilt features. With the support for multiple POP, IMAP, Exchange, and iCloud accounts, versatile mail filters, and a smart conversation view, Apple mail is good enough for required needs. In Apple mail all mail folders are saved separately with the extension of ".mbox" example inbox.mbox, outbox.mbox, drafts.mbox etc.