Can I get a list of all Shared Mailboxes/folders using Microsoft Graph Api

Question

I am trying to fetch the list of all shared mailbox folder list using graph API but i didn't found any API doc in Microsoft graph api document link. I have founded the API when it will return me the inbox messages list of that particular shared mailbox. Its not enough to me according to my requirement because i didnt know about the folder or user who will shared the mailbox with me so i need all the process will work using the graph api.

Thanks

Answer 1

It's possible now with Get-MgUserMailboxSetting

Get-MgUser | Select-Object UserPrincipalName, @{Name='MailboxType';Expression={(Get-MgUserMailboxSetting -UserId $_.UserPrincipalName).UserPurpose}} | Where-Object {$_.MailboxType -Eq 'shared'}

Answer 2

def _getMailboxes():
    
    users = make_graph_call('https://graph.microsoft.com/v1.0/users', pagination=True)


    token_result = client.acquire_token_silent(scope, account=None)
    if token_result:
            access_token = 'Bearer ' + token_result['access_token']
            print('Access token was loaded from cache')
    else:
        token_result = client.acquire_token_for_client(scopes=scope)
        access_token = 'Bearer ' + token_result['access_token']
        print('New access token was acquired from Azure AD')

    if 'access_token' in token_result:
        headers = {
            'Authorization': access_token
        }


    for user in users:
        user_id     = user['id']
        displayName = user['displayName']
        jobTitle    = user['jobTitle']
        mail        = user['mail']

        url = f'https://graph.microsoft.com/v1.0/users/{user_id}/mailboxSettings'

        try:
            graph_result = requests.get(url=url, headers=headers).json()
            #print(graph_result)
            
            if 'userPurpose' in graph_result:
                userPurpose    = graph_result.get('userPurpose')
                if userPurpose == 'shared':
                    print(f"shared mailbox {displayName}: {mail}")


        except Exception as e:
            print(f"Fout bij het ophalen van gegevens: {e}")
                

Answer 3

Maybe you can get a solution by making a MS Graph request to "list users" and by adding some filters to certain synced Exchange AD attributes?

https://learn.microsoft.com/en-us/graph/api/user-list?view=graph-rest-1.0&tabs=http

https://learn.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-sync-attributes-synchronized

Answer 4

Hi @Bhanu,

You can get the particular shared folder using graph API by providing the shared mailbox email address or user id.

Currently, there is no Microsoft Graph API or Microsoft Graph PowerShell SDK available to list all the shared mailboxes.
You can upvote this features request idea Get a list of shared mailboxes, including permissions and based on number of votes received Microsoft Engineering will consider for implementation.

However, you can use Exchange Online PowerShell script to achieve this requirement and please find the relevant PowerShell command from documentation links below:

https://learn.microsoft.com/en-us/exchange/recipients-in-exchange-online/manage-user-mailboxes/use-powershell-to-display-mailbox-information
https://techcommunity.microsoft.com/t5/office-365/listing-shared-mailboxes-and-members-powershell/m-p/241737

Hope this helps.

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