In my previous blog I wrote that the current iPhone already is able to natively deal with multiple exchange accounts, but Apple decided to switch it off. You needed a jailbroken iPhone to unswitch it or use my step by step guide to be able to see your exchange calendars in overlay mode.
The upcoming new OS update (called iOS4) available for free June 21, will finally make an end to our quest.

It seems that Apple has seen the light and will make it possible to add multiple Exchange accounts. The release date for iOS4 is June 21. This new OS is available for current iPhone 3G and 3GS owners and second- and third-generation iPod touch owners and will add new features to these devices. Check http://www.apple.com/iphone/softwareupdate/ for more information and see especially the video on the new OS (at 35’52” Steve Jobs tells about multiple exchange accounts).

Another development is the iPhone 4. This new iPhone will be released on June 24 in US, France, Germany, UK, Japan. Late July it will be available in most European countries also.