Looks like Lync server 2010 hotfixes will be available from Windows Update in mid-May 2011. Under the update method for the Lync Server 2010 Hotfix method 2 outlines that detail.
Method 2 Microsoft Update
You can use Microsoft Update to apply the updates for Lync Server 2010.
Note The updates will be available on Microsoft Update in mid-May, 2011.