Microsoft's guidance when migrating Lync 2010 to Lync 2013 is to install the latest cumulative update for Lync 2010. This would also be my recommendation, however if you are wanting to know if you current Lync 2010 infrastructure can support a migration to Lync 2013, the minimum requirement is Lync 2010 CU6 (June 2012). This was the latest update at the time Lync 2013 Preview was released.
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