Quick answer: If your Outlook calendar shows no holidays for 2027, or they stop partway through 2026, it isn’t something you did. Microsoft lists it as a known issue in Outlook on the web, new Outlook and classic Outlook, with a workaround but no fix date yet. Classic Outlook’s built-in Add Holidays list also only covers 2016 to 2026, so running it again won’t add 2027. Until Microsoft updates the data, subscribe to a holiday calendar from another source or add the days you need as all-day events.
In this guide
Why 2027 holidays are missing
There are two separate reasons, and some people hit both.
- A Microsoft known issue with holiday calendars. Microsoft’s known-issue page, titled “Public Holiday Calendars Missing Dates After June 2026 in Outlook”, says holiday calendars can stop after a date in 2026, show nothing for 2027, or have single holidays missing or on the wrong day. It affects Outlook on the web, new Outlook for Windows, classic Outlook and other Outlook apps that use Microsoft’s holiday data. Microsoft names Austria, China, Denmark, Germany, Hong Kong SAR, India, Israel, Japan, Malaysia, Poland, Singapore, Slovakia, Sweden, the United Kingdom and the United States, and says other regions may be affected too. When we checked on November 5, 2026, the status was Workaround, with no cause or fix date given.
- Classic Outlook’s built-in holiday list ends in 2026. Microsoft’s Add holidays page says the holiday data in Outlook for Microsoft 365, Outlook 2019 and Outlook 2016 covers the years 2016 to 2026. Holidays you add with File > Options > Calendar > Add Holidays come from that list, so nothing for 2027 gets added.
Users in Microsoft’s Q&A forums also report that fixed-date holidays such as New Year’s Day appear in 2027 while movable ones based on Easter are missing. Microsoft’s page doesn’t describe it that way, so treat it as a pattern people have seen rather than the official explanation.
Which cause affects you
| You use | What’s going on | Best option |
|---|---|---|
| Outlook on the web or Outlook.com | The known issue | Fix 1, then Fix 2 if dates are still missing |
| New Outlook for Windows | The known issue | Fix 1, then Fix 2 |
| Classic Outlook, holidays added with Add Holidays | The 2016 to 2026 data limit, and possibly the known issue | Fix 2 or Fix 3 |
| Outlook for Mac | Mac can’t add holidays at all | Fix 2 or Fix 3 |
Microsoft’s Outlook for Mac page says Outlook for Mac doesn’t currently support adding holidays to calendars. A holiday calendar you add in Outlook on the web with the same account will still show up on the Mac, so the web route in Fix 1 and Fix 2 works there too.
Fix 1: Remove and add the holiday calendar again
Microsoft says deleting and re-adding the calendar data may help individual users. It’s quick, so try it first in Outlook on the web or new Outlook.
- In the calendar, find the holiday calendar in the left pane, right-click it and choose Remove, then confirm.
- Select Add calendar and then Holidays.
- Pick your country or region and close the window.
- Go forward to 2027 and check whether the dates you expect are there.
If 2027 is still empty or incomplete, the known issue is affecting your region and you need Fix 2 or Fix 3 for now. If the calendar itself vanished rather than just its dates, see Outlook calendar keeps disappearing.
Fix 2: Subscribe to another holiday calendar
This is the workaround Microsoft suggests: get the dates from another source, such as an official government calendar, one your organization maintains, or a reputable third-party calendar published as an ICS link.
- Find the calendar’s ICS address. Many national governments publish public holidays as a downloadable or subscribable calendar.
- In Outlook on the web or Outlook.com, select Add calendar and then Subscribe from web, as described on Microsoft’s Add a calendar page.
- Paste the address, give the calendar a name and select Import.
A subscribed calendar updates itself, though changes can take a while to appear. Uploading an .ics file instead gives you a one-off copy that won’t update. Microsoft doesn’t check outside calendars, so compare a few dates with your government’s official list before relying on one. If you then use both sources, remove the old holiday calendar so days don’t show twice.
Fix 3: Add the days you need as all-day events
If you only care about a handful of days, create them yourself. In any Outlook, create a new event on the date, turn on All day, set Show as to Free so it doesn’t block your time, and add a category if you want them to stand out. For a holiday that falls on a fixed date every year, set it to repeat yearly. Check the time zone setting is right first, or all-day events can land on the wrong day; Windows showing the wrong time zone covers the Windows side of that.
For admins and shared calendars
Microsoft notes that deleting and re-importing holidays isn’t practical for large organizations. Its suggested alternative is a holiday calendar the organization maintains, for example a shared or group calendar with the official dates that users add once. Microsoft’s Add holidays page also says work or school users can subscribe to a holidays calendar in Outlook on the web to get automatic updates when holidays change, so once Microsoft corrects its data, those subscriptions should pick it up without extra work.
Keep an eye on the known-issue page. When its status changes, re-check the 2027 dates and remove any temporary calendars you added.
What not to do
- Don’t keep running Add Holidays in classic Outlook. It won’t add 2027, and countries you added before get added again, which creates duplicates. If you already have duplicates, switch the calendar to View > Change View > List, arrange by Categories, select the extra holidays and choose Home > Delete.
- Don’t replace the
OUTLOOK.HOLfile in your Office folder with one downloaded from a website. Microsoft doesn’t offer an updated file, editing installed Microsoft 365 files isn’t a supported fix, and an update can overwrite it. - Don’t reset or reinstall Outlook for this. The problem is in the holiday data, not your profile, so resetting Outlook won’t bring 2027 holidays back.
If you’re on classic Outlook and thinking of switching, see how to get classic Outlook back for what each version offers. Either way, holiday dates currently come from the same Microsoft data.
Related guides
- Outlook calendar keeps disappearing: how to get it back
- Windows wrong time in Alberta, BC or Manitoba: how to fix it
- How to reset Outlook to default settings (classic and new Outlook)
- Classic Outlook download: how to get it back on Windows 11 and 10
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