If you are referring to initial migration to Office 365, then I would ask that you post in the O365 forums. Either way, all are available (though the website will be a bit different since you'll have to figure out how to incorporate it using SharePoint
If you are referring to transition from BPOS-S to Office 365, then all of those transfer.
- All mail items transition from BPOS-S to O365
- All email addresses associated with your BPOS-S accounts will transfer to Office 365
- All SharePoint content will transition in the way it was in BPOS-S (minus the deprecated web parts).
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.