Thank you, Marshall. My ISP switched me over from 25 to 587 almost a year ago, so that's not it. Let me put my question differently:

Have the Outlook set-up options changed from 2007 to 2010, or am I just imagining it? In the Advanced settings for Mail, 2010 says "Send and receive settings" and then a checkbox with "Send immediately when connected." Does this also receive immediately when connected or just send?