By Carl Howe
Apple (AAPL) Thursday announced that it sold two million copies or about a million a day of Mac OS X Leopard in the first weekend. I tried to find similar statistics for the Microsoft (MSFT) Vista launch, but the best I could come up with was that Vista sold 20 million copies in the first month (February), resulting in an average sales rate of 714,000 a day. Both numbers reflect pre-orders and machine installs, not just upgrades. So at least for now, Leopard is running neck and neck with the Windows Vista install rate.
All that said, the Leopard numbers will surely fall behind in the next month. Why? Because Apple estimates the total number of machines capable of running Leopard to be only 21 million. I don't think we're going to see 95% market penetration on Leopard in the first month, so enjoy the moment while you can.