CODEWITHSUNDEEP
powershelloutlook
Tyler Laidler
Tyler Laidler

Reputation: 81

Gathering Outlook shared mailbox permissions with Powershell

I am trying to see what accounts might have access to another account's mailbox with powershell.

Get-MailboxPermission -Identity <UPN>

will show me, from an individual account, who else has access. I want to be able to see external access, from a single UPN. Results come like this:

| Identity      | User              | AccessRights               |
|:-------------:|:-----------------:|:--------------------------:|
|[email protected]| NT AUTHORITY\SELF |{FullAccess, ReadPermission}|
|[email protected]|[email protected]|{FullAccess}                |

but if I look at the Ann's permissions:

| Identity          | User            | AccessRights               |
|:-----------------:|:---------------:|:--------------------------:|
|[email protected]|NT AUTHORITY\SELF|{FullAccess, ReadPermission}|

I would like to be able to get a list of all users Ann has access to, without needing to know what that account is beforehand.

Upvotes: 2

Views: 240

Answers (1)

cojak777
cojak777

Reputation: 26

As TomG said, you'll have to list all mailboxes and filter to the user you want. I tested this and it's pretty slow, but I'm not aware of a better way.

Example:

Get-EXOMailbox -RecipientTypeDetails SharedMailbox -ResultSize:Unlimited | Get-MailboxPermission | Where-Object {($_.user -like '*@*')}

Upvotes: 1

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