If all you want to do is keep your email accounts separated, you could just set up another Outlook profile. When Outlook opens, it will give you the choice of profile to start - there’s no co-mingling of emails, as you’ll have separate .pst files.
ro_dreaming, ten18 as the solution so you don’t have to bother loading and learning new software. Besides, Outlook has the best overall set of features so you won’t have to change how you do things.