Front change history: [office365] Office channels offline preventing emails being sent or received

Front reported a major O365 outage affecting a subset of customers, with offline channels preventing email sending or receiving. It started at 2026-05-28 18:24 UTC and was resolved at 2026-06-01 23:35 UTC, lasting 4 days 5 h. Front added automatic channel recovery while continuing to investigate remaining sync failures with Microsoft.