Exchange 2010 GALsync between 2 domains in a forest trust

We have recently created a forest trust with our new partner company.

Next step is to share each organisations Global Address list. How is this achieved.....For free without having to purchase a 3rd party software. Any suggestions?

Long term goal is to migrate users from 1 domain into the other, but that is a long time away. the GALSync is something that has come up as a priority.
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HowzattAuthor Commented:
Thanks for that. It looks like there is quite a bit involved in setting this up. It is something we will definitely be doing long term, but just for the short term, is there an easier solution?
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