Source: https://itunes.apple.com/us/app/lync-2013-for-iphone/id605841731?mt=8
What’s New in Version 6.0
- Intuitive and familiar Skype UI: simplified dashboard and enhanced In-Call and In-Meeting experiences
- Full-screen video, simultaneous viewing of the shared content and speaker’s video, larger buttons for meeting controls
- Support for Active Directory Authentication Library based multi-factor authentication
- General improvements and updates for iOS 9