我正在寻找Lync 2010的客户端和服务器端API.但我找到了许多能够开发的API.任何人都有什么区别？请帮忙
Microsoft Lync Server 2010 SDK http://www.microsoft.com/downloads/en/details.aspx?FamilyID=58ccf6fd-31db-4f15-bafb-c5ef28afc5fc
Microsoft统一通信托管API 3.0软件开发工具包 http://www.microsoft.com/downloads/en/details.aspx?FamilyID=4493BAAB-6214-4770-8CF9-69C813E8A9FA
Microsoft Unified Communications Client API SDK
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=82c468da-3294-4ca9-bbcc-d455cfd06af2