In an emergency like, this might be useful to you for stopping / starting MS Exchange Services:

net stop MSExchangeMSMI /y

net stop MSExchangePCMTA /y

net stop MSExchangeFB /y

net stop MSExchangeDX /y

net stop MSExchangeIMC /y

net stop MSExchangeMTA /y

net stop MSExchangeIS /y

net stop MSExchangeDS /y

net stop MSExchangeSA /y

 To restart the Exchange Server services, type the following:

net start MSExchangeSA

net start MSExchangeDS

net start MSExchangeIS

net start MSExchangeMTA

net start MSExchangeIMC

net start MSExchangeDX

net start MSExchangeFB

net start MSExchangePCMTA

net start MSExchangeMSMI

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