People interested in skype sex
If you already have Windows Live Messenger federation working, no additional steps are necessary to enable Lync-Skype connectivity. Lync users can connect to Skype from Lync 2010 or Lync 2013, including any of the 2013 mobile clients.
Additionally, Skype users must sign in to Skype with a Microsoft account (formerly Windows Live ID) to communicate with Lync contacts.
A Microsoft account is the combination of an email address and a password that you can also use to sign in to services like Sky Drive, Windows Phone, Xbox LIVE, and (and previously Hotmail or Messenger).
Click the Add a Contact icon Skype, then enter their Skype contact information and click OK.
Skype users add Lync contacts by typing their email addresses into the search bar within Skype and clicking Add to Contacts.You can merge your existing Skype account with your Microsoft account for single sign-on across a variety of applications and services.