Outlook calendar showing empty on my Google Calendar

Question

Outlook calendar showing empty on my Google Calendar

dani42 35

Hi everyone!
I've had for a couple of years my work Outlook calendar synced with my personal Google calendar. It recently stopped updating the events, so I deleted the Outlook calendar from my Google calendar, and tried to import it again (using the Outlook-generated ICS link).
I have now tried several times in the last couple of days: it always creates the calendar on my Google calendar but it's completely empty.

I have also tried using GAS-ICS-Sync (https://github.com/derekantrican/GAS-ICS-Sync) but no events show up for some reason.

If I paste in the browser address bar the HTML link generated by outlook for the calendar, I can see the events. However, if I paste the HTML link from the imported calendar in google ("Public URL to calendar"), it is completely empty.

I'va also tried to import it on the Calendar app on MacOS, but I've got error 500 and it seems to not be able to import it.

Any ideas on what may be happening?

Thank you.

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Answer 1

sarah31 5

Any updates to this topic? I was able to import by uploading the file, but as stated above this does not use URL so is not being updated.

dani42 35 Reputation points

2025-09-09T13:44:12.6133333+00:00

Not yet unfortunately

Answer 2

Kimberly Olaño 23,395

Okay now inspect the ICS feed directly since isn’t publishing your events anymore.

Go back to Outlook Web → Settings → Shared calendars.
Under Publish a calendar, copy the ICS link (not HTML).
Paste it into your browser.
- It should download a .ics file.
- Open that file in Notepad/TextEdit.
Look for lines like this inside: BEGIN:VEVENT SUMMARY:Team Meeting DTSTART:20250901T130000Z ... END:VEVENT

If you see no BEGIN:VEVENT blocks (just BEGIN:VCALENDAR and END:VCALENDAR), the feed is empty → Outlook isn’t publishing events. If you do see VEVENTs, then the feed is valid → Google might just be struggling to parse it.

dani42 35 Reputation points

2025-09-05T12:00:31.86+00:00

I can see BEGIN:VEVENT and END:VEVENT
Jarvis 10 Reputation points

2025-09-05T16:11:58.6933333+00:00

I can also see the individual events (BEGIN:VEVENT ... END:VEVENT). The recent ones have dates this month (Sept), and they look correctly formed to my untrained eye.
Jarvis 10 Reputation points

2025-09-05T16:55:26.38+00:00

More interesting information. I took the downloaded .ics file from Outlook (the same one @Kimberly Olaño had us check for the existence of events). I then went to my Google calendar (calendar.google.com) and "Imported" it (Settings --> Import & Export) by uploading the file from my computer. Google imports the calendar events correctly, and they all show up.

This is NOT a fix, of course, because it's a one-time import (not a reference to the URL). But, it does verify that the iCal (.ics) file from Microsoft is well formed and that Google can correctly read it. So, something in Google's process to go out and grab the iCal file from it's URL (Add calendar --> From URL) is broken. And, apparently it is recently broken. However, I suspect it is not broken for everyone or the outcry would be larger than what we're seeing.

I'm just sharing information as I try to get this fixed on my end. I hope it helps.
M 0 Reputation points

2026-03-11T18:04:09.5333333+00:00

I see "BEGIN: VCALENDAR", don't have a Team Meeting option, & have "END " VEVENT"

This isn't correct, but I don't know how to get Outlook to update this so it says the correct thing.

My work organization won't give anything more than "see Busy" visibility to emails outside the organization.
Hornblower409 5,875 Reputation points

2026-03-11T18:42:26.3833333+00:00

Mentioning @Jarvis to be sure he will be aware of the new comment on this thread.

Answer 3

Kimberly Olaño 23,395

Thanks for the update. Next steps to try is to check Calendar Visibility Settings.

Navigate to:

https://calendar.google.com/calendar/u/0/syncselect

Ensure the checkbox for your Outlook-subscribed calendar is checked, so Google knows to fetch and display it.

dani42 35 Reputation points

2025-09-04T22:02:35.6466667+00:00

Yes, it is checked, but the calendar is still totally empty - no events past nor future come up
Jarvis 10 Reputation points

2025-09-05T12:07:55.86+00:00

I checked this box, waited a day, and still no events show up. To be clear, the calendar I am having problems with is through the browser (calendar.google.com) on my laptop.

Thanks for the suggestion, I do appreciate it.

Answer 4

Kimberly Olaño 23,395

Alright dani42, just hit me back with your update. Thanks.

Jarvis 10 Reputation points

2025-09-03T12:43:58.5933333+00:00

Hi @dani42 and @Kimberly Olaño . I am having the same problem. For years, I have linked by work Outlook calendar (vie .ics URL) in my Google calendar. Google calendar is personal, and we have all our family members on it, so it makes sense to be able to view my work schedule there as well. Last week, the events stopped updating. I have removed and re-added the Outlook calendar (more than once) in Google. It looks like it is adding correctly, but no events show up, even after 24 hours. I can paste the .ics URL into a browser, and the .ics file downloads correctly and contains the correct data.

I suppose something could have changed on Google's end, but, again, I don't know what that could be or what I should be doing differently. @dani42 , definitely let us know what happens after waiting for 24 hours. Maybe Google will just fix this in the background and not tell anyone.
dani42 35 Reputation points

2025-09-04T13:38:12.5+00:00

Hi all, unfortunately the calendar is still totally empty today.
Jarvis 10 Reputation points

2025-09-04T14:00:54.7666667+00:00

Hi @dani42 . I have the same story. There are still no (zero) entries from my Outlook calendar showing up in the Google calendar today, after 24 hours of waiting.
Ehaughian 5 Reputation points

2025-09-04T15:00:40.39+00:00

I have the exact same situation here - I'm actually somewhat relieved to find that others are having it and, after performing the above test of downloading the .ics file and opening it in Notebook, it's not my employee locking things down even more.

I use Google to see all mine and my family's calendars in the one place so not having my own busiest calendar - my work one - is a real nuisance. I also integrate my Google calendar with my task manager (work won't let me integrate directly 🙄) so I haven't been able to plan tasks around my complete schedule.

Hoping someone finds / shares a solution soon.

Answer 5

Kimberly Olaño 23,395

Hello! dani42. Thanks for the details. I'm glad to assist you with this.

What you’re seeing is a pretty common issue with Outlook’s published ICS feeds and how Google (and Apple Calendar) handle them. A few things to know:

Test the ICS link directly

Paste the ICS URL (not HTML) into your browser.
If it downloads a .ics file and you can open it in a text editor to see events, then the feed is valid.

If it’s empty, the problem is on Outlook’s side.

Also, Google Calendar quirks

Google can take up to 24 hours to refresh subscribed ICS feeds. Sometimes it will show as empty at first.

If it stays empty after a day, then Google is rejecting the feed or Outlook is serving bad data.

See if this helps. If you need further assistance, just let me know.

Best regards,

Kimberly

dani42 35 Reputation points

2025-09-03T08:46:41.62+00:00

Hi Kimberly, thank you for your reply!

The downloaded ICS shows the event, so the problem must be on Google's side I assume.

I will try to import the Outlook calendar once again today and update you in 24h.

Thanks

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Outlook calendar showing empty on my Google Calendar

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