I ran into an issue where DirSync is not properly syncing to Office365. I decided to do a full sync.
- Navigate to the path C:\Program Files\Windows Azure Active Directory Sync\SYNCBUS\Synchronization Service\UIShell
- Launch the “miisclient.exe” and click on Management Agents.
- Right click on the Active Directory Connector and click on Run
- On the run dialogue, select Full Sync and click on OK.
This will run and complete the full AD Sync.