App does work with iOS 8. – Microsoft Lync 2010 for iPhone Review

UPDATE: If you're having issues with this app force closing after you upgraded your firmware to iOS 8, all you have to do is delete the app and reinstall it. This worked for me and I have an iPhone 6 with 8.0.2. This app did work well prior to the release of iOS 8. Once you update your phone's OS, the app won't even open. The developers for this app haven't issued an update to their app since April 2013, so I doubt they still support this app/will be releasing an update to make this compatible with iOS 8.
Review by D. Brown on Microsoft Lync 2010 for iPhone.