Lync 2010 client 登入問題

狀況：在同一台電腦，第一個帳號可以登入，第二個帳號無法登入。

錯誤訊息：cannot sign in to lync because this sign-in address was not found.

解法：安裝Lync HotFix
http://support.microsoft.com/kb/2464842