I am completely new to mac and have a mac air 2011 running lion fully up to date, I am using office 2011 and have a strange problem with the mailboxes.

I have 3 accounts set up but for some strange reason outlook is confusing the mailboxes, I am probably not making much sense?

If I send an email from account1 then it goes from account1 but the sent message can be stored in account2 sent items? same applies for inbox messages messages addressed to account3 may end up in account2?

Any help appreciated.