29 Jun 2026 Message CenterTeams2 source recordsMessage Center action date · 2 entries MC1226495: Microsoft Teams: Teams Live Events is retiringMessage Center action date · Reference tenants · Microsoft 365 Message Center Archive by Merill FernandoMC1266901: Microsoft Teams: Retirement of legacy third‑party meeting and call control APIsMessage Center action date · Microsoft 365 Message Center Archive by Merill Fernando
30 Jun 2026 Message CenterMicrosoft EntraMC1263280: Microsoft Entra: Security hardening to prevent user account takeover in Microsoft Entra Connect SyncMessage Center action date · Reference tenants · Microsoft 365 Message Center Archive by Merill Fernando
1 Jul 2026 Message CenterDefenderMC1183015: Fix/Update Microsoft Sentinel Account Entity Naming to avoid inconsistent account identification in incidents and alertsMessage Center action date · Microsoft 365 Message Center Archive by Merill Fernando
1 Jul 2026 Message CenterExchangeMC1048624: DNS Provisioning ChangeMessage Center action date · Microsoft 365 Message Center Archive by Merill Fernando
4 Jul 2026 SecuritySharePointMicrosoft SharePoint Server Deserialization of Untrusted Data VulnerabilityCISA KEV deadlineCVE-2026-45659Assessment contextCISA deadline passed 114 days ago
5 Jul 2026 Message CenterExchangeMC1272554: Top domain mail flow report in Exchange Online is retiringMessage Center action date · Microsoft 365 Message Center Archive by Merill Fernando