Shared Outlook Calendar has disappeared

Question

An Outlook Calendar that my wife and I share has suddenly disappeared from my Outlook Calendar. It still appears on my wife's computer.

We set this up a number of years ago, so I have no idea where or how to troubleshoot this. I recall that we each had to create outlook.com email addresses so that we could access Microsoft Exchange.

We are using the Classic version of Outlook. In case it's useful, here's the exact information from the Outlook About page: "Microsoft® Outlook® for Microsoft 365 MSO (Version 2605 Build 16.0.20026.20168) 64-bit."

Thanks to anyone who can point me in the right direction to solve this problem.

Answer 1

This is the answer to the problem from Copilot. Microsoft should be ashamed not to have warned people and provided the answer themselves. I can confirm that the solution works. When in Outlook desktop you will probably have to find the shared calendar and click it twice to get it to populate.

✅ Safe reset sequence (step-by-step)

🔹 Phase 1 — Identify what you currently have (on your account)

1. Open Outlook on the web → Calendar
2. Look in the left pane under:
   • “Shared calendars” or
     • “Other calendars”
     1. Find your wife’s calendar entry
        • Note its exact display name (e.g. Jane – your@email)
          • If you see more than one version, note them both

👉 Do NOT delete anything yet

 

Phase 2 — Cleanly remove the old shared copy (your side)

1. Right‑click your wife’s shared calendar
2. Select Remove (or “Remove from view”)

✅ This only removes your copy — it does not delete her calendar

⚠️ Do not use anything like “Delete calendar” from her account

👉 If there are duplicates:

• Remove all copies of her shared calendar
• Leave your own calendars untouched

 

🔹 Phase 3 — Remove the permission (her side)

1. On your wife’s account (Outlook Web):
   • Go to Calendar → Sharing and permissions
     • Remove your email completely
2. Wait 10–15 minutes (important!)

👉 This pause prevents Microsoft reusing the same broken backend link

 

Phase 4 — Recreate fresh share

1. Still on your wife’s account:
   • Click Share calendar
     • Type your email manually (don’t use address book)
       • Set permission (e.g. “Can view all details”)
         • Send

 

🔹 Phase 5 — Accept correctly (your side)

1. On your account:
   • Open the invitation in Outlook on the web
     • Click Accept

⚠️ Don’t accept in Desktop first — that can recreate the broken path

 

Phase 6 — Force full sync

1. Immediately after adding:

• Open her calendar in Outlook Web
• Scroll straight past August into autumn/winter
• Leave it open for ~1 minute

👉 This helps trigger full data hydration

✅ Safe reset sequence (step-by-step)

🔹 Phase 1 — Identify what you currently have (on your account)

1. Open Outlook on the web → Calendar
2. Look in the left pane under:
   • “Shared calendars” or
     • “Other calendars”
     1. Find your wife’s calendar entry
        • Note its exact display name (e.g. Jane – your@email)
          • If you see more than one version, note them both

👉 Do NOT delete anything yet

 

Phase 2 — Cleanly remove the old shared copy (your side)

1. Right‑click your wife’s shared calendar
2. Select Remove (or “Remove from view”)

✅ This only removes your copy — it does not delete her calendar

⚠️ Do not use anything like “Delete calendar” from her account

👉 If there are duplicates:

• Remove all copies of her shared calendar
• Leave your own calendars untouched

 

🔹 Phase 3 — Remove the permission (her side)

1. On your wife’s account (Outlook Web):
   • Go to Calendar → Sharing and permissions
     • Remove your email completely
2. Wait 10–15 minutes (important!)

👉 This pause prevents Microsoft reusing the same broken backend link

 

Phase 4 — Recreate fresh share

1. Still on your wife’s account:
   • Click Share calendar
     • Type your email manually (don’t use address book)
       • Set permission (e.g. “Can view all details”)
         • Send

 

🔹 Phase 5 — Accept correctly (your side)

1. On your account:
   • Open the invitation in Outlook on the web
     • Click Accept

⚠️ Don’t accept in Desktop first — that can recreate the broken path

 

Phase 6 — Force full sync

1. Immediately after adding:

• Open her calendar in Outlook Web
• Scroll straight past August into autumn/winter
• Leave it open for ~1 minute

👉 This helps trigger full data hydration

Answer 2

Hello. I suspect that there is an issue on Microsoft’s side. There is no official announcement currently. However many users across different locales are posting the same issues today. I’m afraid we have to wait for Microsoft to fix this.

Answer 3

Hi, I reached out to support and was given this answer.

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.

Hopefully sort it out sooner rather than later.

Answer 4

I was able to reestablish seeing the shared calendars again by logging in to the account that owns the calendar and removing the accounts the calendar is shared with. Then readd the sharing to the accounts I want to share the calendar with. Restart Outlook for the account the calendar was shared with. We use Outlook Classic.

Answer 5

I followed the guidance of others, where the owner of the calendar had to delete sharing first and then re-add all sharing permissions, but that was not enough. I then found an email in my inbox asking me to Accept the newly shared calendar. Once I clicked that link, I was then able to see the shared calendar in my list of available calendars. Once I selected it in the list, it took a long time for events to trickle in.

1. Delete sharing and re-add from calendar owner's account
2. Click Accept button in email sent to the people the calendar is being shared with.
3. Select the calendar in the list of available calendars
4. Wait for the calendars to sync up

Note that as of June 19, 2026 I cannot actually edit any calendar that I have the Can Edit permission for. All calendars are View Only, so there is still an issue going on.