What are step for enabling ActiveSync

I have a customer that wants to enable active synch for his Windows Mobile Device.  I have installed BES and Good Messaging before, but never the Exchange Native Active Sync.  What are the steps needed to install?  I want to know if this can be done over the air, or is there a client (pc) side install?  I am seeing that many docs refer to the client side peice.  Is there any dependancy on OMA to get Active Synch working or are they two seperate peices?
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