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Known update issues

Canada time zone change (DST abolished 2026-11-01) breaks Microsoft 365 services

In effectDated changeCommunity report

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Community report – not yet confirmed by the vendor: users or trade media report on it (forums, Q&A sites, Reddit, web research), but the vendor has not confirmed the issue (yet). Use this information with caution.

Summary

Canada's abolition of daylight saving time on 2026-11-01 is reported to cause time errors in several Microsoft 365 services, including Outlook, Exchange Online and Teams. This is based on a news report and community research, not yet confirmed by the vendor. Some issues have a fix, others have no fix date yet.

What changes?

  • Teams Rooms show a time one hour behind the Windows clock.
  • Ad-hoc room reservation in Teams Rooms is wrong.
  • Other Microsoft 365 services (Outlook, Exchange Online, SharePoint on-premises, Power Automate, Fabric, Dynamics 365 F&O) are also reported as affected.

Affected

  • Outlook
  • Exchange Online
  • Teams and Teams Rooms
  • SharePoint on-premises
  • Power Automate
  • Fabric
  • Dynamics 365 Finance and Operations
  • Users and devices configured for Canadian time zones

Preparation and temporary exceptions

No workaround known.

Check and complete

Reported: Edge WebView2 155.0.4283.60 fixes one issue. An Exchange Online PowerShell tool is reported as planned for 2026-11-04. Some issues have no fix date yet.

Recommendation

If you have users or rooms in Canada, check calendar entries and meeting room times. Update Edge WebView2 to 155.0.4283.60 or later. Watch the Microsoft Teams devices known issues page and the Microsoft 365 message centre for official guidance.

Timeline

  1. Daylight saving time (DST) is abolished in Canada; Microsoft 365 services show time errors.

Reports from the community and trade media

Reports from forums, Q&A sites, Reddit and trade media – linked only, without the names of the authors; the vendor’s statement is authoritative.

Sources

Compiled from community reports and web research and translated with AI (Claude) – not yet confirmed by the vendor. The vendor’s statements are authoritative. Updated 2 Nov 2026, 12:29.

Where the information comes from

We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:

  • Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
  • other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
  • community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
  • targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
  • early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online

Summary and translation with AI (Claude by Anthropic) – without any data of visitors.

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