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shockotechcom's avatar
shockotechcom
Iron Contributor
Nov 04, 2021

'Cannot Expand folder' on shared mailbox in cloud

I run EX2016 CU21 on-prem in full hybrid mode with Exchange Online (EXO). I have several users who's personal mailboxes are still on-prem but who have been granted full access permission to the shared mailboxes that were migrated to O365 via a mail enabled security group that's also syncd to AzureAD. The problem we are having is intermittently when they open outlook and click the shared mailbox they get a message indicating 'cannot expand folder' .

What might be causing this?

exchange online
Exchange Server
office 365
outlook
  • Manjupk's avatar
    Manjupk
    Copper Contributor
    Dec 16, 2022

    shockotechcom 

     

    -------please help urgent -----

    Hello,

    I have added the additional mailboxes under the account setting
    and when i open this mailbox i am getting error msg "cannot expand the folder"
    I have full access to user mailbox from the owner of this mailbox

    I have tried removing and adding and restarting but nothing helped to resolve this issue

     

    please help

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