How to find users shared mailbox

Question

How to find users shared mailbox

Zhassulan Mustafin 21

For example user have access to shared mailbox.
How I can find it.

Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-06-06T06:22:33.377+00:00

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Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-06-06T06:22:33.377+00:00

Hi,

Just checking in to see how things are going on with this thread.
Does this issue have any updates? If it has been resolved, please click "Accept as answer" to mark useful post or share your solution, your action would benefit others who have similar issues.
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Answer 1

Aholic Liang-MSFT 13,886 Microsoft External Staff

Hi @Zhassulan Mustafin ,

You can refer to the following cmd to get the addresses of shared mailboxs :

Get-Mailbox -ResultSize Unlimited | Get-Mailboxpermission -user user1601 | select  @{Name="Displayname"; Expression={(Get-Mailbox $_.identity.ToString()).Displayname.ToString()}}, @{Name="primarysmtpaddress"; Expression={(Get-Mailbox $_.identity.ToString()).Primarysmtpaddress.ToString()}}, user, @{Name="AccessRights";Expression={$_.AccessRights}}

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Zhassulan Mustafin 21 Reputation points

2022-05-23T11:04:48.24+00:00

Hi!
This is exactly what I wanted to achieve.

Now I'm trying to export information about all users to file.

Here what I cameup with:
Get-Mailbox -ResultSize:Unlimited | Get-MailboxPermission |select @{Name="Displayname"; Expression={(Get-Mailbox $.identity.ToString()).Displayname.ToString()}}, @{Name="primarysmtpaddress"; Expression={(Get-Mailbox $.identity.ToString()).Primarysmtpaddress.ToString()}}, user, @{Name="AccessRights";Expression={$.AccessRights}}| Where-Object {($.user -like '@')} | Export-Csv C:\Temp\sharedfolders.csv -NoTypeInformation

But for some reason it's now working:

WARNING: An unexpected error has occurred and a Watson dump is being generated: Object reference not set to an instance of an object.
Object reference not set to an instance of an object.
+ CategoryInfo : NotSpecified: (:) [Get-MailboxPermission], NullReferenceException
+ FullyQualifiedErrorId : System.NullReferenceException,Microsoft.Exchange.Management.RecipientTasks.GetMailboxPermission
+ PSComputerName : outlook.office365.com
Martin Meiner Tästensen 461 Reputation points

2022-05-23T18:08:44.9+00:00
When using "like" you need to use wildcard in front and after the text. So in your case where you wanted to see all e-mail adresses, you needed a * in front and behind the @

Now, this could be due to encoding cases, but you had removed the underscore between the $ and . for each command, that won't work. the command structure must be eg. $_.user and not $.user when used like this. If this had been in a foreach loop, then it could be $<variablename from the loop>.user so perhaps that's the place that the confusion came from.

The following code should provide what you tried to archieve with the above code.

$data = Get-Mailbox -ResultSize Unlimited | Get-MailboxPermission | select @{Name="Displayname"; Expression={(Get-Mailbox $_.identity.ToString()).Displayname.ToString()}}, @{Name="primarysmtpaddress"; Expression={(Get-Mailbox $_.identity.ToString()).Primarysmtpaddress.ToString()}}, user, @{Name="AccessRights";Expression={$_.AccessRights}} | Where-Object {$_.user -like "*@*"} | export-csv C:\temp\sharedfolders.csv -Encoding Unicode -NoTypeInformation
Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2022-05-26T05:05:32.813+00:00

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Just checking in to see how things are going on with this thread.

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Zhassulan Mustafin 21 Reputation points

2023-03-08T05:01:57.36+00:00

That works great, but it gives error when finds email with no one in it,
I tried to write exception, but it didn't work.

Answer 2

Martin Meiner Tästensen 461

So just to be clear, do you wish to find all shared mailboxes that a specific user has access to?

If that's the case, then you can archieve this using powershell, simply use a command like below. That will result in showing all mailboxes and permissions that the specified user has access to.

Get-Mailbox -ResultSize unlimited | Get-MailboxPermission -User <insert mailaddress of user>

If this is not what you mean, please elaborate with a few more details what you wish to archieve

Zhassulan Mustafin 21 Reputation points

2022-05-23T05:38:12.123+00:00

Hi Martinta,

Yes, I want to find all shared mailboxes that a specific user has access to.

I tried your command, but it gives me only Identity, without address itself.

Is there any way to extract address?

Answer 3

Jean Sanabia 1

Boa tarde,

Pelo painel de Administração do Office 365 vai na opção Teams e Grupos --> Caixas de Correios Compartilhadas. Será exibido as contas de todas as caixas que estão compartilhadas, clicando na caixa desejada, você consegue verificar quem está com permissão naquela caixa de ler ou de enviar em nome de.

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How to find users shared mailbox

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