This idea has been merged into another idea. To comment or vote on this idea, please visit CUSTCOM-I-1137 Ring Central Video Ability to connect Non 365 Outlook Calendar- Feature Request.
Deficiency: Currently the RC desktop app can only sync calendars for users on Microsoft's email services (e.g., O365), or GMail. There is currently no way for on-prem Exchange (or any other email service) to sync calendar data to RC desktop app.
Idea: Update the RC Outlook plug-in to allow sync between the Outlook desktop app and the RC desktop app. This would resolve the issue for companies using on-prem Exchange, or any service that can be used with Outlook (including O365 and Gmail).