Found an interesting mention on the Microsoft Lync client for iPhone (Lync is more or less a corporate version of the MSN-Messenger).
Sadly it won’t work on my iPhone as I have jailbroken mine and is FAR behind in iOS version 🙁 but then again, if I were to install this I would propable get IM’s from work all the time so guess I can live with it 😉
Microsoft Lync 2010 for iPhone requires a Lync Server or Office365/Lync Online account and will not work without it. If you are unsure about your account status, please contact your IT department.
Download for iPhone: http://itunes.apple.com/us/app/microsoft-lync-2010-for-iphone/id484293461?mt=8
Download for iPad: http://itunes.apple.com/dk/app/microsoft-lync-2010-for-ipad/id484222449?mt=8