I can't send any messages from Outlook; I get the message"Microsoft
could not sign or encrypt this message because you have no certificates
which can be used to send from the e-mail address any of my e-mail
addresses". The message disappears when I turn off ALL my security
options (just turning off encryption doesn't work), but the message
still gets stuck in outbox and goes nowhere when I click on
send/receive. I've switched to Thunderbird, which works fine, but I'd
rather be using Outlook. Any ideas?