Before this commit, when the microsoft sync was reset with the following options: - Delete from the current Microsoft Calendar account - Delete from both An rpc error was encountered: requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://graph.microsoft.com/v1.0/me/calendar/events/<event_id> After this commit, the local events are deleted if necessary and the non-recurring events are deleted on microsoft. We keep the recurring one to be consistant with https://github.com/odoo/odoo/commit/29ce2f0451c140cd16ecc26a51260661ede410bc closes odoo/odoo#133051 Taskid: 3437386 Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>