With IMAP, the master copy of your mail is on the server. Though mail is also downloaded to your personal computer and placed into a local copy of your IMAP server folder structure, it is not necessarily a complete copy at any given time. This is very different from POP. In POP, if you see a summary line for a message in your Inbox, the entire message is there on your personal computer, and you don't have to be connected to the email server to see it. But with IMAP, the summary line may be the only part of the message that has been downloaded to your personal computer. When you ask to see the message, it will be downloaded to your personal computer and then displayed to you, and the copy will remain there on your personal computer till you delete the message in your Inbox.
Source : http://www.stanford.edu/services/imap/firstday.html
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