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Some users are having access to all mailboxes when they configure thier outlook

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for 7 users the get access to all mailboxes so when they configure their outlook profile they get about 700 mailbox so outlook hangs this happens with new created users the same 7 users will get access to them as will 
i tired this
Get-Mailbox | Remove-MailboxPermission -User Administrator -AccessRights Fullaccess -InheritanceType all
nut then i got this
An inherited access control entry has been specified CreateChild ControlType Allow
then o tried removing from the DB level
Remove-Adpermission "DB" -user "jobs" -extendedrights Receive-As
Remove-Adpermission "DB" -user "jobs" -extendedrights send-as
Remove-Adpermission "DB" -user "jobs" -extendedright ms-Exch-Store-Admin
but stilll the same

Answers

hi thank you, looks i need some more detail on how to do this
i saved the lines on a .ps1 file tried to run it on exchange and i got the below , can you illustrate more how to do this
The operation couldn't be performed because object 'sharedmailbox' couldn't be found on 'DC.mydomain.com'.
    + CategoryInfo          : InvalidData: (:) [Get-MailboxPermission], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : E61E2EBE,Microsoft.Exchange.Management.RecipientTasks.GetMailboxPermission
Cannot bind argument to parameter 'Instance' because it is null.
    + CategoryInfo          : InvalidData: (:) [Remove-MailboxPermission], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Remove-MailboxPermission
Cannot bind argument to parameter 'Identity' because it is null.
    + CategoryInfo          : InvalidData: (:) [Add-MailboxPermission], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Add-MailboxPermission

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