I read its possible to upgrade from Tiger 10.4.11 to Snow Leopard, on 2007 MacBook and 2007 MacPro, without first upgrading to Leopard 10.5. Is that indeed the case, and do I need to be aware of any issues? The MacBook is 2,1 with 2.16 GHZ Intel Core 2 Duo processor, and 2 GB 667MHZ memory. MacPro is 1,1 with Dual Core Intel Xeon and 2.66 GHZ processor, 2 Processors, 4 Cores, 5GB memory. My daughter also has a MAcBook, probably similiar to mine, bought from her college around same time as mine. Do I need a family pack if I want to upgrade all 3 units, and to be able to update the applications, browser, etc?