It was a matter of time but the OCS client for iPhone is here, from a company called Modality Systems. Click here for details.
Looks like it needs OCS R2 and CWA and that is about it. The app is called iDialog and it is downloadable from the AppStore

Finally the Exchange 2007 Service Pack 2 has left the building and is downloadable by the public.
Of course it contains all bug fixes included in previous rollup's for Exchange 2007 but it also contains some new features such as a plug-in for Windows Server Backup to natively do Exchange backup without buying any 3:rd party software. This one has been a long standing request that now is fulfilled.
Some other noticeable features included in SP2
* Enhanced Auditing
* Public Folder Quota
* Configure Diagnostic logging via GUI/Exchange Management Console
* Named properties bloat will stop since SP2 don't propagate x-headers to MAPI properties anymore. This is the same behavior as in Exchange 2010. See earlier postings on Named properties bloat part 1 and Named properties bloat part 2
* Dynamic AD schema update
Bu before even installing SP2, you must first extend Active Directory schema. Prepare your AD team for this!!
And if you're planning on upgrading to Exchange 2010, SP2 for Exchange 2007 is a prerequisite and must be installed on every Exchange 2007 server before Exchange 2010 can be introduced into an Exchange 2007 organization.
Some more information about Exchange 2007 SP2
http://msexchangeteam.com/archive/2009/05/11/451281.aspx
Download link for Exchange server 2007 SP2. Be to careful to read the "Release notes" and "what's new in Exchange 2007 SP2" documents on the download page before installing.
Have you been playing with early bits of Exchange 2010? Do you want to participate in the development of the next round of Exchange exams? Well you can! We'll be kicking off the beta for the first Exchange 2010 exam (70-662: TS: Microsoft Exchange Server 2010, Configuring) in the next few weeks.
As with every beta exam, seats are limited. MSFT will be using their new MSL SME database to recruit for the first round of of beta participants before posting to this blog. For your best chance of participating, create a SME profile by filling out the survey on the MSL SME site on Microsoft Connect. (See this post for more information.) If you have already created your SME profile, make sure that you update it to reflect your experience with Exchange 2010.
For more information about how we use your beta comments, see this post over at the MSL Born To Learn blog.