Your voice mails are saved both in Skype for Business (Lync) and Outlook. You can quickly check them in Skype for Business (Lync) and choose one of the options to manage your messages.
When you have new voice mail, the Phone tab displays the number of messages.
Tap the Phone tab to see the caller’s info and play your messages.
Tap Call Back to call back the caller.
Tap Delete to delete the voice mail.