We did a pilot of Office 365 with an eye on using the OneDrive stuff (in addition to migrating to the cloud Exchange service) and found:
- There's no mac client for the business one drive. Only windows. - Documents are silently modified by adding a "signature" to them. In some cases this wouldn't matter, but in others it definitely would. - There was a 20,000 item limit. (files or directories) There's ways to get around this by creating additional collections, but that's hard and has its own limitations and issues. - Individual files had a 2GB size limit. - Those combined to mean that the "1TB" space limit was meaningless.
Note: "One Drive" and "One Drive for Business" are totally different. The stuff connected to "Office 365" is the business stuff and it's really some friendlier front-ends on some kind of Cloud SharePoint thing...