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diff --git a/addons/microsoft_calendar/utils/microsoft_event.py b/addons/microsoft_calendar/utils/microsoft_event.py
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+++ b/addons/microsoft_calendar/utils/microsoft_event.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+from odoo.api import model
+from typing import Iterator, Mapping
+from collections import abc
+
+
+class MicrosoftEvent(abc.Set):
+    """This helper class holds the values of a Microsoft event.
+    Inspired by Odoo recordset, one instance can be a single Microsoft event or a
+    (immutable) set of Microsoft events.
+    All usual set operations are supported (union, intersection, etc).
+
+    :param iterable: iterable of MicrosoftCalendar instances or iterable of dictionnaries
+
+    """
+
+    def __init__(self, iterable=()):
+        self._events = {}
+        for item in iterable:
+            if isinstance(item, self.__class__):
+                self._events[item.id] = item._events[item.id]
+            elif isinstance(item, Mapping):
+                self._events[item.get('id')] = item
+            else:
+                raise ValueError("Only %s or iterable of dict are supported" % self.__class__.__name__)
+
+    def __iter__(self) -> Iterator['MicrosoftEvent']:
+        return iter(MicrosoftEvent([vals]) for vals in self._events.values())
+
+    def __contains__(self, microsoft_event):
+        return microsoft_event.id in self._events
+
+    def __len__(self):
+        return len(self._events)
+
+    def __bool__(self):
+        return bool(self._events)
+
+    def __getattr__(self, name):
+        # ensure_one
+        try:
+            event, = self._events.keys()
+        except ValueError:
+            raise ValueError("Expected singleton: %s" % self)
+        event_id = list(self._events.keys())[0]
+        return self._events[event_id].get(name)
+
+    def __repr__(self):
+        return '%s%s' % (self.__class__.__name__, self.ids)
+
+    @property
+    def ids(self):
+        return tuple(e.id for e in self)
+
+    def microsoft_ids(self):
+        return tuple(e.id for e in self)
+
+    def odoo_id(self, env):
+        self.odoo_ids(env)  # load ids
+        return self._odoo_id
+
+    def _meta_odoo_id(self, microsoft_guid):
+        """Returns the Odoo id stored in the Microsoft Event metadata.
+        This id might not actually exists in the database.
+        """
+        if self.singleValueExtendedProperties:
+            o_id = [prop['value'] for prop in self.singleValueExtendedProperties if prop['id'] == 'String {%s} Name odoo_id' % microsoft_guid][0]
+            return int(o_id)
+
+    def odoo_ids(self, env):
+        ids = tuple(e._odoo_id for e in self if e._odoo_id)
+        if len(ids) == len(self):
+            return ids
+        found = self._load_odoo_ids_from_db(env)
+        unsure = self - found
+        if unsure:
+            unsure._load_odoo_ids_from_metadata(env)
+
+        return tuple(e._odoo_id for e in self)
+
+    def _load_odoo_ids_from_metadata(self, env):
+        model_env = self._get_model(env)
+        microsoft_guid = env['ir.config_parameter'].sudo().get_param('microsoft_calendar.microsoft_guid', False)
+        unsure_odoo_ids = tuple(e._meta_odoo_id(microsoft_guid) for e in self)
+        odoo_events = model_env.browse(_id for _id in unsure_odoo_ids if _id)
+
+        # Extended properties are copied when splitting a recurrence Microsoft side.
+        # Hence, we may have two Microsoft recurrences linked to the same Odoo id.
+        # Therefore, we only consider Odoo records without microsoft id when trying
+        # to match events.
+        o_ids = odoo_events.exists().filtered(lambda e: not e.microsoft_id).ids
+        for e in self:
+            odoo_id = e._meta_odoo_id(microsoft_guid)
+            if odoo_id in o_ids:
+                e._events[e.id]['_odoo_id'] = odoo_id
+
+    def _load_odoo_ids_from_db(self, env):
+        model_env = self._get_model(env)
+        odoo_events = model_env.with_context(active_test=False)._from_microsoft_ids(self.ids).with_env(env)
+        mapping = {e.microsoft_id: e.id for e in odoo_events}
+        existing_microsoft_ids = odoo_events.mapped('microsoft_id')
+        for e in self:
+            odoo_id = mapping.get(e.id)
+            if odoo_id:
+                e._events[e.id]['_odoo_id'] = odoo_id
+        return self.filter(lambda e: e.id in existing_microsoft_ids)
+
+    def owner(self, env):
+        # Owner/organizer could be desynchronised between Microsoft and Odoo.
+        # Let userA, userB be two new users (never synced to Microsoft before).
+        # UserA creates an event in Odoo (he is the owner) but userB syncs first.
+        # There is no way to insert the event into userA's calendar since we don't have
+        # any authentication access. The event is therefore inserted into userB's calendar
+        # (he is the orginizer in Microsoft). The "real" owner (in Odoo) is stored as an
+        # extended property. There is currently no support to "transfert" ownership when
+        # userA syncs his calendar the first time.
+        if self.singleValueExtendedProperties:
+            microsoft_guid = env['ir.config_parameter'].sudo().get_param('microsoft_calendar.microsoft_guid', False)
+            real_owner_id = [prop['value'] for prop in self.singleValueExtendedProperties if prop['id'] == 'String {%s} Name owner_odoo_id' % microsoft_guid][0]
+            real_owner = real_owner_id and env['res.users'].browse(int(real_owner_id))
+        else:
+            real_owner_id = False
+
+        if real_owner_id and real_owner.exists():
+            return real_owner
+        elif self.isOrganizer:
+            return env.user
+        elif self.organizer and self.organizer.get('emailAddress') and self.organizer.get('emailAddress').get('address'):
+            # In Microsoft: 1 email = 1 user; but in Odoo several users might have the same email
+            return env['res.users'].search([('email', '=', self.organizer.get('emailAddress').get('address'))], limit=1)
+        else:
+            return env['res.users']
+
+    def filter(self, func) -> 'MicrosoftEvent':
+        return MicrosoftEvent(e for e in self if func(e))
+
+    def is_recurrence(self):
+        return self.type == 'seriesMaster'
+
+    def is_recurrent(self):
+        return bool(self.seriesMasterId or self.is_recurrence())
+
+    def is_recurrent_not_master(self):
+        return bool(self.seriesMasterId)
+
+    def get_recurrence(self):
+        if not self.recurrence:
+            return {}
+        pattern = self.recurrence['pattern']
+        range = self.recurrence['range']
+        end_type_dict = {
+            'endDate': 'end_date',
+            'noEnd': 'forever',
+            'numbered': 'count',
+        }
+        type_dict = {
+            'absoluteMonthly': 'monthly',
+            'relativeMonthly': 'monthly',
+            'absoluteYearly': 'yearly',
+            'relativeYearly': 'yearly',
+        }
+        index_dict = {
+            'first': '1',
+            'second': '2',
+            'third': '3',
+            'fourth': '4',
+            'last': '-1',
+        }
+        rrule_type = type_dict.get(pattern['type'], pattern['type'])
+        interval = pattern['interval']
+        if rrule_type == 'yearly':
+            interval *= 12
+        result = {
+            'rrule_type': rrule_type,
+            'end_type': end_type_dict.get(range['type'], False),
+            'interval': interval,
+            'count': range['numberOfOccurrences'],
+            'day': pattern['dayOfMonth'],
+            'byday': index_dict.get(pattern['index'], False),
+            'until': range['type'] == 'endDate' and range['endDate'],
+        }
+
+        month_by_dict = {
+            'absoluteMonthly': 'date',
+            'relativeMonthly': 'day',
+            'absoluteYearly': 'date',
+            'relativeYearly': 'day',
+        }
+        month_by = month_by_dict.get(pattern['type'], False)
+        if month_by:
+            result['month_by'] = month_by
+
+        week_days = [x[:2] for x in pattern.get('daysOfWeek', [])]
+        for week_day in ['mo', 'tu', 'we', 'th', 'fr', 'sa', 'su']:
+            result[week_day] = week_day in week_days
+        if week_days:
+            result['weekday'] = week_days[0].upper()
+        return result
+
+    def is_cancelled(self):
+        return bool(self.isCancelled or (self.__getattr__('@removed') and self.__getattr__('@removed').get('reason') == 'deleted'))
+
+    def is_recurrence_outlier(self):
+        return bool(self.originalStartTime)
+
+    def cancelled(self):
+        return self.filter(lambda e: e.is_cancelled())
+
+    def exists(self, env) -> 'MicrosoftEvent':
+        recurrences = self.filter(MicrosoftEvent.is_recurrence)
+        events = self - recurrences
+        recurrences.odoo_ids(env)
+        events.odoo_ids(env)
+
+        return self.filter(lambda e: e._odoo_id)
+
+    def _get_model(self, env):
+        if all(e.is_recurrence() for e in self):
+            return env['calendar.recurrence']
+        if all(not e.is_recurrence() for e in self):
+            return env['calendar.event']
+        raise TypeError("Mixing Microsoft events and Microsoft recurrences")