The idea here is to use the the Calendar Booking tool shown on the Retool faq, to build a Calendar that could sinc with outlook.
The idea is like the one shown on the link, a display calendar that could be used to book rooms on specific dates sou we could book our meeting rooms via retool app. But couldn't find any api or how to integrate it via outlook.
The idea is after booked the room in the scenario, retool could send out emails with the dates, room booked, links or whatever to the people specified on the new created event.
When you say outlook do you mean email inboxes hosted by microsoft exchange? If so, you can use Graph's API, in particular this endpoint that gives you a free/busy view of user schedules. Afterwards you can make posts and create events using the create endpoint.
You'd need to pull the room's availability, and either create/update a meeting to add the room to it.
Also, not sure how you have set up your rooms, but Graph has also that object that can be searched ahd used within calendar events
It doesn't look like a native integration is on our roadmap yet, but I've added your +1, Matheus, to the request in our backlog. We'll reach out if we get any updates internally
