Setup an additional mail account in Outlook, option B

Go to "file" to access the outlook "backstage" view, see 1 below


Click on account seittings and then account settings again (see 2 and 3 below) 


Under account settings click "new" to add *additional* email account (see 4 below) 


Enter new account settings as usual (see 5 below) 


Finalise account settings (see 6 below)


As is common you may be required to enter the account details up to three times, don't forget to check the save settings button


 Once completed you will have unlimited access to all the other accounts folders. Additionally you will be able to send "as" the other account.