ICS file no longer imports events into Outlook

Question

ICS file no longer imports events into Outlook

Pete Lauria 110

Microsoft, ICS files used to import calendar events into Outlook with a simple click. That function stopped working rather recently. Many people have expressed this issue through multiple posts, but all we are getting are run-of-the-mill troubleshooting steps. Telling thousands of people to clear their cache, use new Outlook, use classic Outlook, use Outlook web, drag and drop onto the calendar, etc etc etc etc is a useless waste of time. This is not a problem with thousands of local PCs. Something changed with Outlook. Find out what it is and fix it.

I am using Microsoft Outlook for Microsoft 365 MSO (Version 2506 Build 16.0.18925.20076) 64-bit on Windows 11 v24H2 (OS Build 26100.4652). Just my personal PC and Outlook account. No business policies. No complex programming.

Here's how it's supposed to work:

Someone sends me a meeting invite or recurring event by attaching a properly formatted ICS file to an email
I double click the ICS file
Outlook event gets imported into the calendar

Until recently this worked fine. Now it does not. Getting error: "The operation failed". Does the Outlook development team have anything to say? Are they aware? Have they looked into what update may have broken this BASIC AND EXPECTED behavior?

Please troubleshoot the actual issue instead of making thousands of people go through useless exercises on local PCs that do nothing to address the root cause with Outlook functionality.

Thank you for your efforts in coming up with the real fix.

Louis Müller 15 Reputation points

2025-09-11T09:42:48.0566667+00:00

Having the same issue with a shared outlook ics calendar. It seems like the shared .ics link redirects to an html file instead of an ics file and thus cant be imported. Kinda frustrating that microsoft can't seem to fix this

Ben Fitzhardinge 0

I also have the same problem.

The Outlook generated ICS link no longer loads a file, but rather it redirects to a error page.

Here's the response for the HTTP GET request.

HTTP/1.1 302
Alt-Svc: ": 443";ma=2592000,h3-29=":443";ma=2592000
Cache-Control: no-cache, no-store
Content-Length: 437
Content-Type: text/html; charset=utf-8
Date: Wed, 10 Sep 2025 03:57:20 GMT
Expires: -1
Location: /owa/auth/errorfe.aspx?httpCode=500&msg=3673577647&0waError=Microsoft.Exchange.Clients.Owa2.Server.Core.OwaBasicUnsupportedException&owaVer=15.20.9094.21&be=CY8PR05MB10155&ts=134019502410623754&fe=CY8PR12
CA0010&reqid=&Creqid=&Cid=&hmac=-sfsRfnxq¡7dTUzsL3NUz68oFoR1iAlTnNn8dI67ep8.

Kaderli Manuel 0 Reputation points

2025-10-27T06:52:22.4733333+00:00

Can we expect this functionality to work again in Outlook 365 (on Windows)?

Was it removed intentionally, or is it a bug that will be fixed?

9 answers

Your answer

Louis Müller 15 Reputation points

2025-09-11T09:42:48.0566667+00:00

Having the same issue with a shared outlook ics calendar. It seems like the shared .ics link redirects to an html file instead of an ics file and thus cant be imported. Kinda frustrating that microsoft can't seem to fix this
Ben Fitzhardinge 0 Reputation points

2025-10-01T05:01:18.49+00:00

I also have the same problem.

The Outlook generated ICS link no longer loads a file, but rather it redirects to a error page.

Here's the response for the HTTP GET request.

HTTP/1.1 302 Alt-Svc: ": 443";ma=2592000,h3-29=":443";ma=2592000 Cache-Control: no-cache, no-store Content-Length: 437 Content-Type: text/html; charset=utf-8 Date: Wed, 10 Sep 2025 03:57:20 GMT Expires: -1 Location: /owa/auth/errorfe.aspx?httpCode=500&msg=3673577647&0waError=Microsoft.Exchange.Clients.Owa2.Server.Core.OwaBasicUnsupportedException&owaVer=15.20.9094.21&be=CY8PR05MB10155&ts=134019502410623754&fe=CY8PR12 CA0010&reqid=&Creqid=&Cid=&hmac=-sfsRfnxq¡7dTUzsL3NUz68oFoR1iAlTnNn8dI67ep8.
Kaderli Manuel 0 Reputation points

2025-10-27T06:52:22.4733333+00:00

Can we expect this functionality to work again in Outlook 365 (on Windows)?

Was it removed intentionally, or is it a bug that will be fixed?

Answer 1

Hello!

I understand how frustrating it is when something as basic as importing ICS files into Outlook suddenly stops working, especially after it’s worked flawlessly for a long time. You’re definitely not alone—many users are experiencing the same issue where double-clicking an .ics calendar event gives an error like “The operation failed” instead of adding the event to your calendar as expected.

Here’s what’s currently known:

What’s Happening?

Previously: Double-clicking an attached .ics file in Outlook would instantly import the event or meeting into your calendar.
Now: For many on the latest Outlook for Microsoft 365, this process is broken; you receive an error, and the import doesn’t work—even after trying basic troubleshooting steps.

Common Workarounds (That Many Find Unhelpful)

You might see the following suggested, but these steps aren’t resolving the root problem for most people:

Clearing Outlook’s cache or browser cache
Switching between Classic and New Outlook
Dragging and dropping the file onto the calendar
Using Outlook Web (OWA)

These “fixes” usually don’t restore the old single-click import behavior, and users continue to report problems.

What’s the Real Issue?

Based on user reports, it appears something changed within Outlook itself, possibly after a recent update to Microsoft 365 Outlook. This is not due to user error, local configuration, or a wave of unrelated PC issues. The problem seems systemic and affects multiple users across versions and setups—implying a change or bug in Outlook’s handling of .ics file.

What’s Needed?

A Real Fix from Microsoft: Users are asking for the Outlook development team to acknowledge the issue, investigate what specifically has changed regarding .ics file handling, and provide a genuine solution—rather than generic troubleshooting steps.

What Can You Do Right Now?

Keep an eye on official Microsoft forums, as repeated user feedback may prompt an update or patch soon.
You can report the issue through Outlook’s feedback tool for additional visibility.
In the meantime, using Outlook Web or alternative calendar apps may temporarily help if you need to import .ics files urgently, acknowledging this is not ideal.

Thank you for highlighting this issue so clearly. I hope Microsoft addresses this soon, and that sharing this summary helps you feel heard and less alone in your frustration.

Best Regards,
Jerald Felix

CityBoy312 0 Reputation points

2025-10-07T13:14:28.3166667+00:00

Same issue-this is supposed to be a productivity suite? Please fix your mistake. Price increase of 40% on 365 suite should cover the costs! Wondering if the value if still there...
Andrea S 0 Reputation points

2025-11-18T15:07:25.3266667+00:00

Dragging and dropping the ics, got the appointment into my Outlook calendar, which is a start. But the resulting entry is not editable. I wanted to add a google map link for driving instructions, which used to work just fine.
Jacek Bogucki 6 Reputation points

2026-01-17T20:30:30.4533333+00:00

this llm-generated answer is the cherry on top of the incompetence. :)

Answer 2

Eddie Jones 10

I have found that after double clicking the .ics the issue is the focus isn't set to the Calendar in Outlook. To get around this after tying to open navigate to the calendar and you should see a prompt to specify the Calendar to add to. ICS

Ken Snyder 5 Reputation points

2025-11-05T18:44:30.3833333+00:00

That is exactly the issue, I don't want to manually select the only default calendar, I only have one calendar. It should automatically select the default calendar like it did previously.
Adrian 0 Reputation points

2026-04-01T18:56:34.2866667+00:00

This works. Kind of annoying that it opens up to Outlook online instead of my app.

Answer 3

I know this is old and this is still happening to me. But I found if you go to default apps and change .ics to open in outlook, it will open and you just press import and the event is added to your calendar.

User's image

You see mine was set to notepad. You click on it and change it to outlook and click set as default.

User's image

Now when you double click on the file and it will allow you to import it into outlook.

User's image

Yes, it is an extra button from now on, but it works. You click the .ics file and then import and you are good to go.

Have a blessed day

Answer 4

Fred Nielsen 15

I am experiencing this problem with new Outlook, classic Outlook continues to work fine importing when opening a ICS from the file system.

The only workaround I've been able to sort out is to manually import the ICS within the UI, 2 ways:

Select Add Calendar, and then Upload from File, and then Browse, select the calendar you want to import the event(s) to, and then hit Import
Drag the ICS file into Outlook, which essentially raises the same dialogue as #1 - all you have to do is select the calendar you want to import the event(s) to, and then hit Import

Greg Guidarelli 0 Reputation points Microsoft Employee

2025-09-09T13:55:53.26+00:00

THANK YOU! Option 1 didn't work for me. There are 3 options provided after clicking Add Calendar (From Address Book..., From Room List..., From Internet....); none worked. But Option 2 worked when I dragged the .ICS file on top of the calendar! :)

Answer 5

Diane Poremsky 8,175 Independent Advisor

What type of email account do you have configured in Outlook? POP, IMAP, Outlook.com, or Microsoft Exchange? If you have an outlook.com account, you can try turning off calendar improvements in File > Account Settings > Account Settings. Double click on the account and click More Settings then uncheck the option for calendar improvements.

I believe that is related to another calendar bug. If so, it should be fixed soon (in the next update.)

Do you get the same error if you import it. File > Open & Export > Import & Export? It's too many steps, but if it works...

Helen Franklin 0 Reputation points

2025-08-19T12:35:21.3266667+00:00

Thanks for this quick work-around - this will do me for now until a proper solution is created by MS.

Share via

ICS file no longer imports events into Outlook

9 answers

Your answer