First off, what's the user account here? I can't really look at things from this end unless I know that. Also, what's actually happening? IE's default "cannot display" error message doesn't really tell me much. Do you know if it's timing out, or if it's getting invalid/corrupted data, or maybe it can't resolve a DNS entry or something? For now, try accessing email via IMAP and then clean out some junk. IE may be timing out waiting for the server to process all those messages.