I have an existing exchange 2007 server, I want to install exchange 2013 onto a new server. I have done the domain/forest prep and I am ready to do the installation. But I am curious about which points during the installation of ex2013 will cause my existing ex2007 server to be offline/unavailable. IE: If I do the install during normal working hours, will it bump everyone offline until the installation is completeand all of the configuring is done?
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