Whenever I delete an email from my iPhone it is also deleted from the server

I recently upgraded to ios 7.  I was previously using POP for Hotmail and I liked it because I could delete an email from my iphone but it remained on the Hotmail server (didn't delete it from my inbox when I logged in via computer).  I tried POP after the upgrade and it won't let me limit how many emails are on my iphone, thus it's downloading every single email.  I tried setting it up via the outlook and the exchange options but whenever I delete an email from the iphone it deletes it from the server.  I just want to be able to delete an email from my iphone and keep it on the server so that I can refer to it when I log in via my computer.  I have seen that perhaps IMAP would solve this.  However, I am having trouble getting the correct incoming mail server address.  Long question but any help would be greatly appreciated!