Well.. if you haven't been there, consider your self lucky :).
upgrading Lync to v.2013 on Office 2010 systems (you may ask why, we had our reasons :), mainly to start the O365 on the cloud effort) can be a nightmare as the Lync feature seem to grab the "Common Tools" from the Office 2013 also with it (at least through the Office Customization Tool), that interact with other, existing tools that may not work.. windows Search (not the Outlook search) may return email items with the Office 2013 logo and not open when clicked. upgrading to Office 2013 may bring the "configure utilities" screen if you have Lync 2013 on Office 2010 install.
so.. word of caution..