With 2 accounts, how can each accounts incoming mail be directed to an individual account?
You can achieve this by setting up a mail rule in Tools -> Rules.
Once you are at the new rule wizard window:
Choose ‘Apply custom rule on message I receive’, than next.
At conditions, select ‘Process with account’, and choose the mail account by clicking the underlined ‘account’ in the box list below. Than next.
At actions for rule: Select ‘move to folder’. And again, choose the folder you want the mails being move to be clicking on the word underlined ‘folder’ by the box below. Than finish
Repeat the steps above for the next account if required.