Hi John,
You can move all your e-mai to anywhere you want, but I think it must all go. You could for example move it all to Outlook.com which is the replacement for hotmail, and uses the same outlook online app as Office 365. If you go the outlook ms route, they would also still SkyDrives, and web apps they could use.
BTW the fact that P1 plans do not have phone support is very clearly stated on the office 365 web page.