Can I upgrade a Mac Mini (2.66 GHz Core 2 Duo, 4 GB Mem.) running OS X Server (Snow Leopard 10.6.8) to Mt. Lion or Yosemite w/out also updating to the more recent OS X Server Software (through separate purchase)? And if so, what happens to/with the existing OS X Server Software? The Mac Mini is not being used as a server and that functionality is not really needed. Probably don't need new Yosemite features either. Would Mt. Lion be an easier/safer upgrade?
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