Indeed, you cannot set that. Rather, BIS chooses the "best" protocol based on what it "finds" on the server to which you direct it. So, if your server is only serving out POP, then that's what BIS chooses. I thought that BIS would choose IMAP if the same server offered both, but I am not positive about that. Typically, if you want fine control, you must either have different servers to direct BIS towards (one for POP, a different for IMAP) or have the server be able to control specifically what it puts out (e.g., as in GMail, where the end user controls if the server provides POP, IMAP, or both).
Occam's Razor nearly always applies when troubleshooting technology issues!
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