IPhone – Use an iPhone as a live system monitor

The priority for accessing any email service would be:

1. Exchange: Push email, folders, syncs read/unread status, contact sync, calendar sync
2. IMAP: Folders, syncs read/unread status
3. POP3: Bare bones email reading, usually only useful for a single client unless you "keep a copy on the server"

It seems that some people have had success using Exchange; IMAP seems to require either a premium account or 3rd party software; and POP3 is possible for free accounts.

Keep an eye on Apple's page as they will probably update it as new solutions are added by Microsoft.

This doesn't seem to be possible with Activity Monitor. Unfortunately top doesn't accept several pids to monitor either, so you have to revert to a half-manual (and rather unelegant) solution using Terminal:

while :; do
    clear
    top -l 1 -pid PID-TO-MONITOR | tail -1
    top -l 1 -pid ANOTHER-PID-TO-MONITOR | tail -1
    sleep 5
done

Given some basic bash skills you can wrap this into a shell script if needed often.

Or open several terminal windows and run top on specific processes in each of them. Might be kind of heavy on your CPU though...