Shared Outlook Calendar has disappeared

+1, my shared calendar also dissapeared. We tried removing and re-adding it from my wife's account, but it only adds 3 weeks of events but none after 8 july.

Has anyone gotten this to resolve? If so how?

Because I didn't see the shared calendar I couldn't remove it. But removing myself and re-adding from my wifes account, I at least got 3 weeks of events back. I tried deleting it now from my side and adding it again. I do see events after the 3 weeks, however not all. So its nice at least some events are there but it is not to be trusted that it is complete.

Same issue - tried all of the suggested steps to restore a shared calendar, but nothing worked.

Same problem here.

Seems to be resolved for me now. All missing events are back in the calendar.

I have the same problem as the OP and can no longer access my husband's calendar via my desktop or my phone.

His permissions are all as they should be. We have shared calendars for years and have never had a problem until 15 June.

We both use outlook.live.com.

I hope Microsoft sort this out soon.

And literally, YES overnight and right before my eyes the shared calendars were GONE. Poof! Gone. Same as all the other comments listed here. Another example of MS making things difficult. I've used shared calendars for years. Is this an iran syndrome of stuff ups? Have you guys heard of Euro-Ofiice, and more? Perceptions are the HARDEST thing to change and Microsoft you have a so bad perception that is only getting worse. New Outlook? C'mon. I am so angry at my time being wasted and having no recourse to accountability and transparency. Checkout OneCalendar on your phone, I was able to add the account so have my 'share' back on that but on the PC, nope. I now have to cobtact my shares and advise them of the issue. Microsoft won't. Increasingly frustrated...

The shares have been removed in their entirety.

I have reached out to support and was given this information.

As per the Tier 2 team, I would like to inform you that we are currently receiving multiple cases related to this issue, and the engineering team is actively working to resolve it in a timely manner.

I still have the same issues with 5 shared calendars missing, has anyone got this resolved yet?

Hi Charlie I was able to resolve it by making sure I was the one deleting the calendar (so in the systems the process is followed correctly). But because the calendars are missing I needed to remove myself and re-invite myself from the account the calendar was shared with. Then the calendar appeared on my side again but was incomplete (missing events). But at least it was there so I could initiate the deletion myself. Then I invited myself again and now it seems complete.

Same experience as @J Wassenaar . Removing and re-adding the permissions helps partially, but entries are limited for the next 3 weeks only.

I am serieously considering moving to the Google Calendar (or any alternative).

Same issue. Calendars shared for years with family no longer visible. When I look at my shared calendar settings to try and share I can see the calendar still being shared with spouse with full edit functions. Contacted Microsoft 3 times and each time told is a known issue and team working on it. It's been 4 days with no resolution.

i have the same issue with all the shared (and other custom) calendars disappeared.

We’re sorry for the inconvenience related to the shared calendar disappearing, the issue has been resolved now. If you have a shared calendar that disappeared or its showing incorrect details, please re-add the shared calendar using Sharing invitation from calendar owner. 

Thank you for your patience.

Umang (MSFT)

We’re sorry for the inconvenience related to the shared calendar disappearing, the issue has been resolved now. If you have a shared calendar that disappeared or its showing incorrect details, please re-add the shared calendar using Sharing invitation from calendar owner. 

Thank you for your patience.

Umang (MSFT)

We’re sorry for the inconvenience related to the shared calendar disappearing, the issue has been resolved now. If you have a shared calendar that disappeared or its showing incorrect details, please re-add the shared calendar using Sharing invitation from calendar owner. 

Thank you for your patience.

Umang (MSFT)

Same here. My wife's calendar disappeared from view around 18/6 - so later than some have reported - but I have been unable to successfully dismiss reminders from her calendar for some weeks. But the issue isn't symetrical:

• My wife can still see my calendar
• I can still se my wife's calendar on my laptop using new Outlook
• My wife's calendar disappeared from my 'phone using Outlook for mobile

As others have reported, the problem can be 'fixed' if the owner un-shares and then re-shares their calendar ...

Microsoft people reading this even following the steps to re-share calendars, there are still issues. The ability to Edit someone's shared calendar (after edit permissions were granted) is still broken with a message that the folder is read only.

Coder12 and MikeSch have also reported the same broken behavior.

I can confirm this also worked for me. Thank you John!

@Umang Shah it is still broken. Can share the calendar but the shared user cannot edit the calendar despite being given the appropriate permissions.

Issue is NOT resolved! Using recommend method we have calendar sync showing for one of the calendars but only into mid July which is 3 weeks into future and only a few weeks going back.

To Microsoft people please don't say issue as resolved until it's properly result especially if people are telling you there are still issues.

I hope work has not stopped on this issue??

My calendar still isn't shown on my gf Android or in her Outlook.com. I have Removed the shared and added it several Times.

Still broken!! I have 5 kids each with their own calendar plus the wife - we are NOT going thru all the iterations of deleting everyone's calendar shares and re-adding all of them!

Just fix the dang problem...

Hi, once you readd the calendar it will be synced with owner's calendar over few hours to one or two days depending on how big owner's calendar is, and eventually you will start seeing all events from future. please dont delete the calendar and readd as it will restart the process.

Umang Shah how can you say it's resolved? The calendar should be available under the "Other calendars" list. You're not going to fix it? Why do I need to re-add it? The sharing shows correct on the other users calendar. You have the data. You have backup. As other says, even re-adding doesn't bring back edit. Poor form.

Matthew, Shah has given a typical unhelpful Microsoft employee answer. Scroll down and look at the phases to perform that I have set out from Copilot. Note the delay aspect. Also, there is a little wrinkle, if on the device being shared from. In your case remove the share that you see. If there is no entry for you do not use address book but type in your email address. Then delete the first share offered as that might be the MAPI link. Either way Wait at least 15m. Then repeat to add your email and follow the steps.

Microsoft, as ever, create the problem but they will not fix it for you and they fail to provide a clean phased set of remedial steps. I have tried to help with what I have posted below. What you see on the other person's calendar is the old MAPI link which needs to be removed and a new REST one created. Don't ask me what REST stands for but it is the new Exchange sharing system which is meant to be better and more reliable.

Since @John Tanzer laid down the challenge, I Googled:

MAPI (Messaging Application Programming Interface) and REST (Representational State Transfer) are two very different models for managing and syncing Outlook and Exchange data. While MAPI is a legacy, client-focused Windows protocol, REST is the modern, cloud-first standard used to build lighter, faster, and more reliable cross-platform integrations.

My point here is that Microsoft have changed the underlying platform. The old links are no longer valid and are never going to work ever again. If we want to share calendars with one another we MUST get rid of the old broken linkages, create new working ones and go forward from there (until the next time that Microsoft decides to change the underlying platform). There's no point in complaining that Microsoft should fix the issue - they won't, and, quite probably, can't ... 😉

@philip42h that is exactly what I have been writing about and I agree with you. The issue is not the change from MAPI to REST, which is clearly beneficial, but the way in which Microsoft have failed completely to manage the change. Simply leaving users to hang out and dry. No notification. No proper support. Let alone a step by step what to do.

I hope that what I set out as Phases from Copilot will help people.

Even there some might find a wrinkle in that the system might find the old link before creating the new one. Hence my writing that if you do not see the link on the source account when you first add by using the recipient of the share's email you might need to remove that when it pops up, wait and then add again in the same way so as to ensure that it is a new link to the REST system.

As you write, the key is getting rid of the old MAPI link but, in true MSFT way, that might not be as obvious as it should be.

I have also written that the way to check is using Properties for the share in Outlook Classic on the recipient device. If they show REST you are OK. If not you might have to go through the pain again.

... and there may be another wrinkle meaning that this issue may linger a little longer.

When I lost access to my wife's calendar, she didn't loose access to mine - suggesting a phased migration of accounts to the new platform. I suspect that we won't get back to stable calendar sharing until all the accounts in the share set have been migrated ... ?

I'm expecting to have to remove and recreate calendar shares again when the other half gets migrated ...

Thanks @John Tanzer MAPI and REST isn't the problem. they could resolve this properly without user intervention if they cared to. I don't understand why they don't care. I'm a premium subscriber; If I have to configure this again for my family of 6 (sharing for everyone each way), I may as well look for a dedicated calendar provider, that doesn't see the service provided as a rounding error on the revenue income statements.

@Matthew Rowan I could not agree more. The behaviour of Microsoft is outrageous. I suspect that they could not care less about consumer as against business access.

Having said that, if you have Outlook Desktop Classic (I cannot find out how to do this in Web access) right click on the share and see if the Properties show nothing/MAPI/REST. If either of the first two then deleting the share, real bore in your case as you have to go to 6 devices in OL Web, and then creating a new one after waiting for at least 15 minutes should get rid of MAPI and reset to REST.

Check in your copy of OL desktop against each share.

In my case, fortunately I only share with my wife, that has worked. I can edit her calendar.

@John Tanzer I do have it mostly working now for me. I had waited a couple of hours, and now Edit has come back. I would need to fix everyone else's calendars too. Since the Outlook app on Android merged the calendar instead of a separate app it has been a pain for a while, it might be a good time to go after a better solution.

My calendars are still connected via MAPI, the shared family ones are now REST.

My issue was also they completely dissappeared. Fortunately I had the years old Accept calendar invite emails for most still in archive so I could search those and click Accept again without having to undo and redo the shares from everyone. With the other I could change the access (Edit -> View) and change it back and that triggered a new email.

@Matthew Rowan interesting one. My own calendar is also MAPI when I look at the properties in OL Desktop Classic on each of my two PCs. Likewise, my wife's calendar on her PC in MAPI. Yet the share on my PC for her is REST!

As for Android OL, I actually like the calendar being merged with email etc. but I suppose your easy option is to sync Exchange with your base Android calendar if you want a separate one. In the same way that I use Android Contacts app but the OL contacts are also there.

I have the same issue on a shared calendar. Completely dissapeared on every device!

Any idea how to fix ? The solution doesnt work for me.

Our company had the same issue last night. We have 11 employees and share a general calendar. It disappeared from one user's desktop email. We solved it by having that user load up her laptop, which also had outlook on it. Once it was uploaded, the two versions must have synced, because it returned to the desktop.