Calendar - Jewish Holidays End in 2026

There is currently no Microsoft-managed way to force the missing 2027 Jewish holidays into new Outlook; add the built-in holiday calendar once and leave it subscribed so Microsoft’s entries appear automatically when the acknowledged 2027 data issue is resolved.

Microsoft confirms that some holiday calendars lack entries for 2027 across new Outlook, Outlook on the web, and classic Outlook. Israel is among the affected regions, and Microsoft is investigating the issue. ^1^

Add the official Microsoft holiday calendar

In new Outlook for Windows:

1. Open Calendar.
2. Below the calendar grid, select Add Calendar.
3. Select Holidays.
4. Search for and select the relevant Jewish or Israel holiday calendar available for your account.
5. Confirm that it appears in the calendar navigation pane.

This is Microsoft’s supported method; holiday calendars are added as separate calendars rather than importing one particular year. ^2^

For a Microsoft 365 work or school mailbox, the same subscription can be added through Outlook on the web → Calendar → Add calendar → Holidays. That subscription receives updates when Microsoft adds or changes holiday data. ^3^

What will not resolve it

• Removing and adding the calendar again will not create entries that are absent from Microsoft’s holiday data.
• Switching to classic Outlook does not avoid the current issue. Microsoft says the missing 2027 data can affect both clients.
• Classic Outlook’s bundled holiday information covers Gregorian years 2016–2026, and its custom .hol file capability is not currently available in new Outlook—the feature comparison lists it as Investigating. ^4^

Because you do not want a third-party subscription or another calendar, there is no presently documented first-party workaround for filling the missing 2027 entries. The practical options are to keep the Microsoft holiday calendar subscribed and wait for Microsoft’s update, or manually create individual events in your primary calendar using dates validated by your organization. The latter would be manually maintained data, not an official Microsoft holiday feed.

References

1. Public Holiday Calendars Missing Dates After June 2026 in Outlook | Microsoft Support
2. Add holidays to your calendar in Outlook | Microsoft Support
3. [Outlook.com](https://support.microsoft.com/outlook/add-a-calendar-in-outlook-com-or-outlook-on-the-web)
4. Feature comparison between new Outlook and classic Outlook | Microsoft Support