Hello.We're an MSP and since around 17th/18th Jan we've had one or two users in 7 different companies (tenants) report issues with shared mailboxes or shared calendars they have access to not updating. We've been able to get working again by simply unticking option in Outlook profile to cache shared mailboxes. But with this amount of clients with the same issue, I've not been able to see anything regarding known M365 health / windows update issue that causes this in the last few days. Anyone else seen this issue and know root cause or have any acknowledgement of known issue

gblackburn came here because we are having the same issue with multiple users. I will try your fix but this bug needs to be worked out.

I managed to fix the problem by manually going to the few people who had the issue, removed the "Download shared folders" tick under Advanced in Account management, close Outlook and open it up again. Then going back intro the same settings and switch it back on again. This will start a sync of the Shared mailbox back to the OST file and update automatically again. Hope this helps until we know why this started happening.

Have multiple users in my organization with this same issue. Latest Office 365 Update may be the culprit? We are on Current Channel for updates and the latest update came out right about when this issue started.

EmileSteenkamp This was my workaround when I posted the question but you have made in clear for anyone who comes here.As of 19/1 (but I did not see visibility of this till 22/1) it looks like this has now appeared in the public domain as an M365 issue. So we await a Microsoft fix with another suggested workaround below:January 21, 2022 11:16 PMTitle: A small percentage of users' shared mailboxes aren't automatically refreshing new email in the Outlook desktop clientUser Impact: Users' shared mailboxes aren't automatically refreshing for new email in the Outlook desktop client.More info: While we're focused on remediation, users that have access to Outlook on the web can use this connection method to bypass this problem. Some affected users have reported that manually refreshing their folders using key shortcuts, such as pressing F9 or CTRL + M, may result in intermittent success as well.Current status: We're continuing to review Fiddler trace logs and are in the process of gathering additional Time Travel Debugging (TTD) traces from our internal reproduction of the issue to provide insight into the cause of this problem and identify possible mitigation options.Scope of impact: A small percentage of users aren’t seeing their shared mailboxes automatically refresh.

hi all see this link.. I opened a case few weeks back in feb and after some wait, this seem to be fixed now https://support.microsoft.com/en-us/office/shared-mailbox-is-not-automatically-refreshing-for-new-email-in-outlook-94b97f45-c57c-45f3-9716-f3f6bec47c73

Shared Mailboxes or Calendars not updating since mid Jan 2022 unless disable Shared Mailbox Caching

MicheleRJ
Copper Contributor
Jan 19, 2022
gblackburn came here because we are having the same issue with multiple users. I will try your fix but this bug needs to be worked out.
- MicheleRJ
  Copper Contributor
  Jan 20, 2022
  MicheleRJ tried the shared mailbox cache off and it worked for 10 min and then same thing again
bwilkerson217
Brass Contributor
Jan 19, 2022
Have multiple users in my organization with this same issue. Latest Office 365 Update may be the culprit? We are on Current Channel for updates and the latest update came out right about when this issue started.
Nick_at_interco
Copper Contributor
May 17, 2022
******* FINALLY I FOUND A PERMANENT SOLUTION FINALLY ******

1. Connect to Exchange Online With PowerShell

PowerShell:

Connect-ExchangeOnline

Set-OrganizationConfig -OAuth2ClientProfileEnabled $true

2. Regedit Users Computer

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\Identity

Add DWORD 32:

EnableADAL

Hex Vaule:1

Close Outlook 365 reopen and there you go.
CDiamond
Copper Contributor
Jan 19, 2022
gblackburn My company is having the same issue, since we don't install the account in account settings there is no way to cache the inbox. Anyone find a fix for this yet?
EmileSteenkamp
Copper Contributor
Jan 20, 2022
I've picked up the same issue 19/01/2022 with multiple users using various shared mailboxes. Any advise would be helpful
JanMost
Copper Contributor
Jan 20, 2022
gblackburn
We have the same issue on multiple users and multiple shared mailboxes, since Jan 10 2022
jpenberthy
Copper Contributor
Jan 21, 2022
gblackburn same issues here. Hopefully there will be a solutions soon.
AtanasM
Iron Contributor
Jan 21, 2022
Same issue here, since last Office update.It seems like a bug.
BenBaz
Copper Contributor
Jan 21, 2022
We started to have this issue too. It appears to be escalating throughout our user base.
Terick96
Copper Contributor
Jan 21, 2022
gblackburn I've seen the same thing with multiple users. First report was January 20th.

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Shared Mailboxes or Calendars not updating since mid Jan 2022 unless disable Shared Mailbox Caching

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