PowerShell
Outlook -- List Mail Folders

Uses the Microsoft Graph API to list Outlook mail folders.
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/{id | userPrincipalName}/mailFolders
# Note: It is also possible to use the literal string "me" for the current logged-on user.
# For example: GET /me/mailFolders
$http.ClearUrlVars()
$http.SetUrlVar("userPrincipalName","chilkatsoft@outlook.com")
$success = $http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/mailFolders",$sbResponse)
if (($success -ne $true) -and ($http.LastStatus -eq 0)) {
    $($http.LastErrorText)
    exit
}

$json = New-Object Chilkat.JsonObject
$json.LoadSb($sbResponse)
$json.EmitCompact = $false

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

$($json.Emit())
$("----")

# In my test case, this is the result (see below)
# Apparently, this lists folders without listing subfolders (aka child folders)
# There's another REST API call to list child folders.

# To iterate over the folders:
$i = 0
$numFolders = $json.SizeOfArray("value")
while ($i -lt $numFolders) {
    $json.I = $i
    $($json.StringOf("value[i].displayName"))
    $i = $i + 1
}

# The output from the above loop:

# 	Archive
# 	Deleted Items
# 	Drafts
# 	Inbox
# 	Junk Email
# 	Outbox
# 	Sent Items

# ------------------------------------------------------------------------------------
# The raw JSON response: 

# {
#   "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/mailFolders",
#   "value": [
#     {
#       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAG8XunwAAAA=",
#       "displayName": "Archive",
#       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
#       "childFolderCount": 0,
#       "unreadItemCount": 0,
#       "totalItemCount": 0
#     },
#     {
#       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEKAAAA",
#       "displayName": "Deleted Items",
#       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
#       "childFolderCount": 0,
#       "unreadItemCount": 0,
#       "totalItemCount": 0
#     },
#     {
#       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEPAAAA",
#       "displayName": "Drafts",
#       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
#       "childFolderCount": 0,
#       "unreadItemCount": 0,
#       "totalItemCount": 0
#     },
#     {
#       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA",
#       "displayName": "Inbox",
#       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
#       "childFolderCount": 2,
#       "unreadItemCount": 0,
#       "totalItemCount": 4
#     },
#     {
#       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEiAAAA",
#       "displayName": "Junk Email",
#       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
#       "childFolderCount": 0,
#       "unreadItemCount": 0,
#       "totalItemCount": 0
#     },
#     {
#       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgELAAAA",
#       "displayName": "Outbox",
#       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
#       "childFolderCount": 0,
#       "unreadItemCount": 0,
#       "totalItemCount": 0
#     },
#     {
#       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEJAAAA",
#       "displayName": "Sent Items",
#       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
#       "childFolderCount": 0,
#       "unreadItemCount": 0,
#       "totalItemCount": 14
#     }
#   ]
# }
# 

# ------------------------------------------------------------------------------------------------------
# This example applies to: Exchange Online | Office 365 | Hotmail.com | Live.com | MSN.com | Outlook.com | Passport.com
# 
# The Microsoft Graph Outlook Mail API lets you read, create, and send messages and attachments, 
# view and respond to event messages, and manage folders that are secured by Azure Active Directory 
# in Office 365. It also provides the same functionality in Microsoft accounts specifically 
# in these domains: Hotmail.com, Live.com, MSN.com, Outlook.com, and Passport.com.