Bringing this up from the dead. How were you able to get to the Lead and Contact GUID. I'm trying to do the same with our instance and the CRM team is having difficulty pulling up the GUID and putting it into a field where I can sync to and grab it from.
Since this idea was submitted back in 2013, we have since successfully deployed this feature in our environment as follows (btw, we're not on Dynamics 2013 Online, but this works with all versions):
Hope this helps!
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