We plan to synchronize the resource calendar using the "calendarView delta" method (https://docs.microsoft.com/en-us/graph/api/event-delta?view=graph-rest-1.0&tabs=http).
We have found that it is possible to synchronize a calendar without specifying a start and end date, but for now this feature is in beta.
What is the best way to retrieve the events of a future period, while time is running? For example, if we want to retrieve the events of the coming year, we need to create a delta [today, year +1], but next month this delta, encrypted in the token, will represent the period [month -1, month + 11] .
We thought of a solution that would consist in renewing the token every month, but this has two drawbacks: it forces us to run a full synchronization once a month for all synchronized resources, and we don't really synchronize a sliding one-year window.