Sign In To sign in to Fuze for Office 365: Open Outlook and click Sign In in the Fuze for Office 365 pane. Enter your Fuze username and password. Click Sign-in.You are signed in to Fuze for Office 365. Related articles Fuze for Office 365 System Requirements and Installation Fuze for Office 365 Overview Office 365 Connected Account Installing Fuze Outlook Integrations Overview