Microsoft Online Services Team blogged about how to connect an iPhone to the Microsoft Online Services.
Check this out: http://blogs.technet.com/msonline/archive/2010/02/02/feature-of-the-week-use-your-iphone-with-exchange-online.aspx
Cheers,
Anderson Patricio
http://blogs.msexchange.org/patricio
Twitter: @apatricio
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