Scenario: You want to pull a list of messages using GraphAPI via PowerShell for a specific Mailbox.
Prerequisites: You already have the following configured:
–Registered App in Azure: An Azure Registered app to connect to with Application Permissions for Mail.Read, Mail.ReadWrite, Mail.ReadBasic.All, and Mail.Send. (Not all permissions listed may be necessary for the specific function below)
–Bearer Authentication Token: A method for pulling back a bearer token and storing it to pass Authorization into your RestAPI package (See my previous post about get-accesstoken). The get-accesstoken authenticates against your Registered App in Azure.
Scriptlets in PowerShell:
#1. Define $mbx
$mbx = "steve@steveman.com"
#2. Build your $AppURI (Examples)
$appuri = "https://graph.microsoft.com/v1.0/users/$mbx/mailfolders/inbox/Messages" #using common folder names
$appuri = "https://graph.microsoft.com/v1.0/users/$mbx/mailfolders/AAMkADY3ODhkMDNlLTRjM2YtNDJjYi04YTkzLTFmNjFhYTcyMjA2NwAuAAAAAAAM5kRh6DylRZ4XsImGGVClAQA8oulgK3qgQ659gFhlXH_UAAAAAAEMAAA=/Messages" #Using Base64 naming for any folder in mailbox
$appuri = "https://graph.microsoft.com/v1.0/users/$mbx/mailfolders('RecoverableItemsDiscoveryHolds')/Messages"
$appuri = "https://graph.microsoft.com/v1.0/users/$mbx/mailfolders('RecoverableItemsPurges')/Messages"
#3. Run the following in a Do-While loop so it collects for than 10 messages at a time:
#Create your Collection Variable
$messages = @()
#Run a Do-While Loop
Do{
"Running $appUri"
$RestSplat = @{
URI = $appuri
Headers = $(get-accesstoken)
Method = 'GET'
ContentType = "application/json"
}
$Tempresults = Invoke-RestMethod @RestSplat
$messages += $tempresults.value
$appuri = $tempresults."@odata.NextLink"
}While($appuri -ne $null)
#Display your Messages
$Messages
Ex-Shell 