Exchange 2013 CAS server maintanance mode before the start the OS security patches every month

Hi MVP,

I have push the July'19 Month Microsoft OS patches using with SCCM 2012 on Exchange 2013 CAS server. Need to reboot the CAS Exchange 2013. Without users impact, i have to reboot the Exchange 2013 server. Please let me know the procedure.

Infrastructure for Messaging servers:

1- Exchange 2013 CAS server

3-Mailbox Servers Exchange 2013.

Thanks,

Sami

Thanks-Sami