使用powershell重置郵箱密碼時無法找到密碼參數

我正在使用powershell命令重置現有郵箱的密碼，但是會出現錯誤消息，顯示「找不到與參數名稱'Password'匹配的參數。「這很奇怪，因爲'密碼'是根據MSDN http://technet.microsoft.com/en-us/library/bb123981.aspx的參數。我錯過了什麼？我的代碼：使用powershell重置郵箱密碼時無法找到密碼參數

using (Runspace remoteRunspace = RunspaceFactory.CreateRunspace(connectionInfo)) 
    { 
     try 
     { 
      remoteRunspace.Open(); 

      PowerShell ps = PowerShell.Create(); 
      ps.Runspace = remoteRunspace; 
      ps.AddCommand("Set-Mailbox"); 
      string PrincipalName = userId + emailDomain; 
      ps.AddParameter("Identity", identity); 
      ps.AddParameter("UserPrincipalName", PrincipalName); 
      ps.AddParameter("Name", name); 
      ps.AddParameter("DisplayName", name); 
      ps.AddParameter("Password", emailPwd);//emailPwd is defined as securestring and set value previously, so it cannot be the exception reason 
      ps.Invoke(); 
      return true; 
     } 
     catch (Exception ex) 
     { 
      throw ex; 
      return false; 
     } 
     finally 
     { 
      remoteRunspace.Close(); 
     }

來源

2011-07-28 Steven Zack