Product    
Product Version KB  Link
Lync 2010 (64bit client) 4.0.7577.4103 2701664 MS download
Lync 2010 (32bit client) 4.0.7577.4103 2701664 MS download
Lync Server 2010  4.0.7577.199 2493736 MS download
       
Lync 2010 Group Chat Client 4.0.7577.4102 2701665 MS download
Lync 2010 Group Chat Admin 4.0.7577.4102 2707265 MS download
       
Lync 2010 Phone Edition 4.0.7577.4100 2724545 MS download
[Polycom CX700 and LG-Nortel IP Phone 8540]
Lync 2010 Phone Edition 4.0.7577.4100 2701671 MS download
[PolycomCX500, CX600 and CX3000]
Lync 2010 Phone Edition 4.0.7577.4100 2701667 MS download
[Aastra 6721ip and 6725ip]
Lync 2010 Phone Edition 4.0.7577.4100 2701670 MS download
[HP 4110 and 4120]