Companies with users in local Active Directory environments who is considering using Microsoft Office 365 Beta for enterprises can use "Directory Synchronization Tool" to sync AD users. Using this tool, service administrators can keep Office 365 users, contacts, and groups updated with changes made in the local Active Directory.
However, this tool has a few limitations:
- Directory synchronization to create users in Office 365, then disabling directory synchronization.
- Multiple on-premises forests
- Scoping or filtering (that is, limiting to a domain, organizational unit, or other container or group)
- Synchronizing more that 10,000 objects (Contact MS Support in this case)