Apple reveals iPhone software development kit

Pretty much as expected, Apple has revealed the iPhone SDK: a software package that will enable application developers to create programs for the Apple iPhone. The iPhone developer tools are based on the company's existing 'Cocoa' tools for developing Mac software. Developers can download a free version of the beta iPhone software development kit, although the full version of the kit will not be available until June. In addition, Apple announced a deal with Microsoft that will soon enable iPhones to work with Microsoft's Exchange business email software. It also said business iPhone users will be able to access virtual private networks, which allows companies to give their staff mobile access to internal computer systems. [Sources: Macworld.com, WSJ.com]