When you open Exchange Management Console , it refuse to load and shows the following error “The WS-Management service cannot process the request. The user load quota of 1000 requests per Z seconds has been exceeded. Send future requests at a slower rate or raise the quota for this user. The next request from this user will not be approved for at least Z milliseconds”

after search, an IISRESET or IISRESET /NOFORCE just solved my probelm and i could browse the Exchange Management Console normally