Week view breaks when "Start week on" is set to Monday, but works correctly when set to Sunday.

Joe Hazel 0 Reputation points
2026-09-14T18:51:00.86+00:00

Summary: Week view breaks when "Start week on" is set to Monday, but works correctly when set to Sunday.

Steps to reproduce:

  1. Add an iCloud CalDAV account to Outlook (Mac) alongside existing Google/IMAP accounts.
  2. Go to Outlook Settings > Viewing (Calendar) and set "Start week on" to Monday.
  3. Switch the main calendar to Week view.
  4. Click "Today," or click a date in the mini calendar on the left sidebar.

Expected result: Week view should show the current week with all synced events, matching what Month view already displays correctly.

Actual result: Week view displays the wrong week (typically the prior week) and does not show events that are confirmed to exist and sync correctly, since they appear properly in Month view. Clicking a date in the mini calendar does not move the main Week view to the matching week; the two stay out of sync.

Workaround found: Setting "Start week on" to Sunday instead of Monday resolves both issues immediately. All events display correctly in Week view and the mini calendar navigation matches the main pane.

Outlook | MacOS | New Outlook for Mac | For home
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  1. Chloe-V 12,790 Reputation points Microsoft External Staff Moderator
    2026-09-15T02:39:59.2666667+00:00

    Hi @Joe Hazel

    Thank you for documenting the behavior and workaround so clearly.

    Since the events appear correctly in Month view, and changing Start week on from Monday to Sunday immediately restores both the events and mini-calendar navigation, this appears to be an Outlook for Mac Week-view display issue rather than an iCloud synchronization problem.

    For now, please continue using Sunday as the temporary workaround. Also, ensure Outlook is fully updated, then report the issue through Help > Feedback in Outlook for Mac, including your Outlook version, macOS version, account types, and the reproduction steps above. Microsoft specifically recommends Help > Feedback for submitting Outlook for Mac feedback.

    Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas only.

    Thank you for your understanding. 

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