为什么在WSManConnectionInfo对象中connectionUri与交换和windows的不同？

对于交换,uri使用的连接是:

http://machineName/powershell

WSManConnectionInfo对象按以下方式创建:

WSManConnectionInfo connectionInfo = new WSManConnectionInfo(new Uri("http://machineName/powershell"), "http://schemas.microsoft.com/powershell/Microsoft.Exchange", ExchangeCredential)

要连接到Windows,使用的是uri

http://machineName:5985/wsman 

WSManConnectionInfo对象按以下方式创建:

WSManConnectionInfo connectionInfo = new WSManConnectionInfo(new Uri("http://machineName:5985/wsman"), "http://schemas.microsoft.com/powershell/Microsoft.PowerShell", credential);

为什么交换和窗口的连接uri有区别？