Having a need to rapidly sync passwords to Office 365 using Directly Sync (DirSync) I come across the following method that seems to work with minimal effort.  By default the DirSync only kicks off ever 3-5 min’s.

To initiate a full password sync you can do the following:

  1. Open PowerShell, and then type:

     
  2.  Then Type:

     
  3. Press Enter
  4. Load Services.msc
  5. Restart the Forefront Identity Manager Synchronization Service Service. (FIMSynchronizationService)

In your application event logs you should notices multiple events  of 656 (Password Sync Requests) and Even 657 (Password Sync Results) indicating that your full password sync has kicked off.