mail_environment_office365: add fetchmail support

mail_environment_office365/models/__init__.py

@@ -1 +1,2 @@
 from . import ir_mail_server
+from . import fetchmail_server

mail_environment_office365/models/fetchmail_server.py

@@ -0,0 +1,17 @@
+# Copyright 2022 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html)
+
+from odoo import models
+
+
+class FetchmailServer(models.Model):
+    _inherit = "fetchmail.server"
+
+    @property
+    def _server_env_fields(self):
+        base_fields = super()._server_env_fields
+        office365_fields = {
+            "use_microsoft_outlook_service": {},
+        }
+        office365_fields.update(base_fields)
+        return office365_fields