Well, these things can change at any time:
- DNS used by the mail servers
- Networking connectivity on any hop between your Android device and the mail servers
- ..... other things
Have you checked what server settings you're using on the computer? Something's got to be different, I don't believe in evil fairies
I don't happen to have a sympatico account, but @hotmail is still working fine here.
I also encourage you to update to the latest AquaMail development build, since it has a workaround for an IPv6 issue present in Android. I don't *think* that "pop.bc.hotmail.com" has IPv6, but just in case?