PowerShell
Outlook --Download Attachments for a Specific Message

Demonstrates how to download the attachments for a particular email message.
Note: This example requires Chilkat v9.5.0.67 or greater.
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PowerShell
Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$http = New-Object Chilkat.Http

# Use your previously obtained access token here:
# See the following examples for getting an access token:
#    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
#    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
#    Refresh Access Token (Azure AD v2.0 Endpoint).
#    Refresh Access Token (Azure AD Endpoint).

$http.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN"

$sbResponse = New-Object Chilkat.StringBuilder

# Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
# Note: It is also possible to use the literal string "me" for the current logged-on user.
# For example: GET /me/messages/{message_id}/attachments

$http.ClearUrlVars()
$http.SetUrlVar("userPrincipalName","chilkatsoft@outlook.com")

# Assume we already have a message ID from previously listing the messages in a folder
$messageId = "AAMkADYzZWE3YmZmLWU0YzgtNGNkZC04MGE1LWFiYTFlNTRlY2QwYQBGAAAAAAAu7cUXL5YOTrdsUIw7-v8FBwBUcG0qWqkmQYqWLHQataQxAACnwqJUAABUcG0qWqkmQYqWLHQataQxAACnwrnOAAA="
$http.SetUrlVar("message_id",$messageId)

# Send the request to download the attachments.
$success = $http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments",$sbResponse)
if (($success -ne $true) -and ($http.LastStatus -eq 0)) {
    $($http.LastErrorText)
    exit
}

# The attachment data is contained within the JSON response.
$json = New-Object Chilkat.JsonObject
$json.LoadSb($sbResponse)
$json.EmitCompact = $false

$("Status code = " + $http.LastStatus)
if ($http.LastStatus -ne 200) {
    $($json.Emit())
    $("Failed.")
}

# This is a sample JSON response.  The code for parsing and extracting/saving the attachments
# is shown below.

# 	{
# 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA%3D%3D')/attachments",
# 	  "value": [
# 	    {
# 	      "@odata.type": "#microsoft.graph.fileAttachment",
# 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAft6wtbaSJU6sgQLi98DI0Q==",
# 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
# 	      "name": "fishing.pdf",
# 	      "contentType": "application/pdf",
# 	      "size": 295680,
# 	      "isInline": false,
# 	      "contentId": "F861B218BE380F44B16933097FDDACFC@namprd20.prod.outlook.com",
# 	      "contentLocation": null,
# 	      "contentBytes": "JVBERi0xLjMKJcfsj6 ... yZWYKMjk0MzY5CiUlRU9GCg=="
# 	    },
# 	    {
# 	      "@odata.type": "#microsoft.graph.fileAttachment",
# 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAXS7qXQ-iRUCYXnhJpN8Ihg==",
# 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
# 	      "name": "testCert.cer",
# 	      "contentType": "application/octet-stream",
# 	      "size": 1674,
# 	      "isInline": false,
# 	      "contentId": "5E51FA33EF0F8941ACC8260395CB1A33@namprd20.prod.outlook.com",
# 	      "contentLocation": null,
# 	      "contentBytes": "MIIFRjCCBC6gAwIBA ... 7pt3C5w=="
# 	    }
# 	  ]
# 	}

$sbSavePath = New-Object Chilkat.StringBuilder
$attachData = New-Object Chilkat.BinData
$lastMod = New-Object Chilkat.CkDateTime
$fac = New-Object Chilkat.FileAccess

$i = 0
$numMessages = $json.SizeOfArray("value")
while ($i -lt $numMessages) {
    $json.I = $i

    $("name: " + $json.StringOf("value[i].name"))
    $("contentType: " + $json.StringOf("value[i].contentType"))
    $sizeInBytes = $json.IntOf("value[i].size")
    $("size: " + $sizeInBytes)

    # Extract the data and save to a file.
    $sbSavePath.SetString("qa_output/")
    $sbSavePath.Append($json.StringOf("value[i].name"))

    $attachData.Clear()
    $attachData.AppendEncoded($json.StringOf("value[i].contentBytes"),"base64")
    $attachData.WriteFile($sbSavePath.GetAsString())

    # Get the last-modified date/time and set the output file's last-mod date/time..
    $lastMod.SetFromTimestamp($json.StringOf("value[i].lastModifiedDateTime"))
    $fac.SetLastModified($sbSavePath.GetAsString(),$lastMod)

    $("----")

    $i = $i + 1
}

# The output of the above loop is:
# 
# 	name: fishing.pdf
# 	contentType: application/pdf
# 	size: 295680
# 	----
# 	name: testCert.cer
# 	contentType: application/octet-stream
# 	size: 1674
# 	----
#