PowerShell Runspace to Exchange Online Budget Exceeded Error

我有一个在Exchange Server上以编程方式调用PowerShell命令的应用程序。将应用程序连接到Exchange在线服务器outlook.office365.com是成功的，并且调用单个命令有效，但在短时间内按顺序发送多个命令，服务器会阻塞并回复以下消息。
我试过用runspace。关闭和运行空间。处置，但没有效果。
从下面的消息中，我看到在60秒内最多有5个运行空间，但是我的代码正在关闭和处理运行空间，并且该限制不应该是和问题。当然，我总是有可能做错了什么。

消息(一些文本被点遮挡):

Connecting to remote server failed with the following error message : Fail to create runspace because you have exceeded your budget to create runspace. Please wait for 45 seconds.
Policy: CN=GlobalThrottlingPolicy_....,CN=Global Settings,CN=ExchangeLabs,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=namprd05,DC=prod,DC=outlook,DC=com; 
Snapshot: Owner:    Sid~NAMPR05A001'.......~WSMan~false
BudgetType: WSMan
ActiveRunspaces:    0/3
Balance:    600000/1800000/-3000000
PowerShellCmdletsLeft:  199/200
ExchangeCmdletsLeft:    9223372036854775807/Unlimited
CmdletTimePeriod:   5
DestructiveCmdletsLeft: 60/Unlimited
DestructiveCmdletTimePeriod:    Unlimited
QueueDepth: Unlimited
MaxRunspaces:   5
MaxRunspacesTimePeriod: 60
LastTimeFrameUpdate:    4/23/2013 8:48:20 PM
LastTimeFrameUpdateDestructiveCmdlets:  4/23/2013 8:40:36 PM
LastTimeFrameUpdateMaxRunspaces:    4/23/2013 8:48:08 PM
Locked: False
LockRemaining:  00:00:00 For more information, see the about_Remote_Troubleshooting Help topic

下面是简化的代码(实际更复杂，但基本上就是这样):

private Collection<PSObject> GetUser(string userName, string password)
{
    try
    {
        serverName = "https://outlook.office365.com/powershell-LiveID?PSVersion=2.0"
        SecureString pass = new SecureString();
        foreach (char x in password.ToCharArray())
        {
            pass.AppendChar(x);
        }
        WSManConnectionInfo connectionInfo = new WSManConnectionInfo(
            new Uri(serverName), PSNamespace, new PSCredential(userName, pass));
        connectionInfo.AuthenticationMechanism = AuthenticationMechanism.Basic;
        connectionInfo.SkipCNCheck = true;
        connectionInfo.SkipCACheck = true;

        CallContext.SetData("WSManConnectionInfo", connectionInfo);
        using (Runspace runspace = RunspaceFactory.CreateRunspace(connectionInfo))
        {
            using (PowerShell powershell = PowerShell.Create())
            {
                try
                {
                    powershell.AddCommand("Get-User");
                    powershell.AddArgument(userName);
                    runspace.Open();
                    powershell.Runspace = runspace;
                    return powershell.Invoke();
                }
                catch (Exception e)
                {
                    return null;
                }
                finally
                {
                    runspace.Close();
                    runspace.Dispose();
                }
            }
        }
    }
    catch (Exception e)
    {
        return null;
    }
}

谢谢你的建议。

鲍里斯