The Lync 2010 mobile client for Google Android smartphones isn't supported on Android tablets or on other non-phone Android devices. For more information, go to the following Microsoft Knowledge Base article:
Note If you’re looking for help with Lync Mobile 2013 for Android phones or tablets, go to the following Microsoft websites:
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.