Spanning Sync v3.1.2 is fully compatible with OS X 10.7 Lion and takes advantage of its support for 64-bit processing.
Of course, Spanning Sync 3 is still compatible with both Snow Leopard and Leopard. Mac OS X 10.4 "Tiger" users should continue to use Spanning Sync v2.1.3.
As always, please let us know if you have any questions or run into any problems. Thanks!