Get the list all the mailboxes to which a user has access

No doubt that powershell has made us save our time and now we all are used to it. But some of us find it difficult to make commands, so today I have written this blog to help you get the output of all the mailboxes to which a particular user has access to:

First before running any of the below commands we need to Connect to Exchange Online Powershell using: https://technet.microsoft.com/en-us/library/jj984289(v=exchg.160).aspx

1. Below command provides the list of all the user/shared/room/etc mailboxes to which a particular user has Full Access:

Once connected, then run the below command:

Get-Mailbox -RecipientTypeDetails UserMailbox,SharedMailbox -ResultSizeUnlimited | Get-MailboxPermission -User emailoftheuser

2. Get the list of all the mailboxes to which members of a security group have access to:

Get-Mailbox | Get-MailboxPermission -User emailofsecuritygroup

3. Get the list of all the mailboxes to which a particular user has Full Access permissions to:

Get-Mailbox | Get-MailboxPermission -User emailoftheuser

4. Get the list of all mailboxes to which a user has Send As permission to:

Get-Mailbox | Get-RecipientPermission -Trustee emailoftheuser

5. Get the list of all the user mailboxes to which members of a security group have Send As permission:

Get-Mailbox -RecipientTypeDetails UserMailbox -ResultSizeUnlimited | Get-RecipientPermission -Trustee emailofsecuritygroup

6. Get the list all mailboxes to which a user mailbox has Send on behalf of permissions:

Get-Mailbox | ? {$_.GrantSendOnBehalfTo -match "emailoftheuser"}

Note: These commands are only for Exchange Online.

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