According to Microsoft, some 2 million iOS 5 devices are connected to Hotmail, and that number is growing by some 100,000 every day.

With the release of iOS 5 it became easier for user to configure their iDevice to send and receive email via Hotmail because Apple added it as a default option in the Add Account … screen. And it seems that users have embraced this option enthusiastically.

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Microsoft also offers up an interesting breakdown of Hotmail users based on which iDevice they use.

40% of those connecting to Hotmail use an iPhone 4, but remarkably a massive 24% are using iPhone 4S handsets. This is particularly amazing considering that the 4S has only been available for three weeks.