This would be useful in eliminating the need to use Microsoft Outlook calendar if this feature was integrated into Webex calendar. The ability to check other's schedules to coordinate open meeting times is an everyday business activity.
We just released the ability to schedule a meeting from the Webex app which updates the meeting in the user's calendar (Exchange, Exchange Online, or Google Calendar). It also provides free/busy availability. Schedule a Webex Meeting from the Webex app Meetings Calendar
Does this feature resolve your request?