The updated unified communications app formerly known as Lync, includes updated notifications, enhanced security features, synchronization of conversations across devices and updated emoticons "as long as you're running the latest server software," Microsoft execs said.
Those with the Lync 2013 app on their Windows Phones automatically will be updated to the new Skype for Business app. The more granular details:
If you have a Windows Phone 8.1 and higher but do not have the Lync 2013 app, you can download the new Skype for Business app in the Windows Store.
If you have Windows Phone 8.1 and higher and currently have the Lync 2013 mobile app, the new Skype for Business app will replace your existing app and tile automatically.