MAPI

Generally, when one wishes to setup IMAP or MAPI it is to log on to a corporate server. In that case there is usually someone to help with the matter.

At any rate, given that you have all the necessary input such as mail server names and the corresponding port numbers, here is a good explanation complete with screenshots, etc.

http://support.google.com/mail/bin/static.py?hl=en&page=ts.cs&ts=1668960&rd=1