问题描述：
======
访问Exchange 2007 OWA时，收到如下错误信息：

RequestUrl:
https://remote.clientdomain.com:443/owa/auth/error.aspx?aspxerrorpath=/owa/auth/logon.aspx
User host address: client IP address

Exception
Exception type: System.Runtime.InteropServices.COMException
Exception message: No more threads can be created in the system. (Exceptionfrom HRESULT: 0x800700A4)

Call stack

System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32
errorCode, IntPtr errorInfo)
System.Management.ManagementEventWatcher.Start()
Microsoft.Exchange.Clients.Owa.Core.OwaRegistryKeys.RegisterSMIMERegistryChangeEvent()

Microsoft.Exchange.Clients.Owa.Core.OwaRegistryKeys.Initialize()
Microsoft.Exchange.Clients.Owa.Core.Globals.InitializeApplication()
Microsoft.Exchange.Clients.Owa.Core.Global.ExecuteApplicationStart(Object
sender, EventArgs e)

原因：
======
WMI组件损坏。

解决方案：
======
使用如下步骤重建WMI Repository

1. 停止Windows Management Instrumentation服务。
2. 备份C:\windows\system32\wbem\Repository目录，并删除该目录下的文件。
3. 重启Windows Management Instrumentation服务。
4. 等待几分钟使相应的改变生效。