Install Lync on your Windows computer
First make sure Lync isn’t already installed.
If Lync isn't installed:
Sign in to Office 365 with your work or school account.
Go to Settings > Office 365 Settings.
Choose Software > Lync.
Keep in mind:
Lync may already be installed on your computer as part of Office 365.
If Lync isn’t listed, contact your workplace technical support to make sure your account includes the Lync Online service.
Install Lync on your mobile device
Go to your app store and search for Lync 2013. For details, see the Getting Started guide for your device at Microsoft Lync 2013 for Mobile Clients.
Install Lync on your Mac
If your organization installed Office for Mac Standard 2011 on or after October 1, 2011, then you already have Lync for Mac 2011. To make sure you have the most current version, see Microsoft Lync for Mac 2011 Update.