Google accounts are useful for accessing a number of online resources. The one most often used for SIU purposes is Google Analytics. This method will create a Google Account that can Access Analytics and other tools, without creating a private Google email account. All mail and communications will go to your existing business account that is protected and secured by SIU.
Private email accounts should not be used for business purposes. As such, this is the recommended method to setup accounts for accessing Google-based tools.