Classic ASP
Outlook -- Create Map of Folder Paths to IDs

Recursively descends folders and creates a hashtable of folder paths to IDs. This can be done once at the start of your program (or even less if the map is persisted to a file or database).
The reason this is necessary is because folder ID's need to be passed to the Outlook API, and an application will typically be working with folder paths.
Note: This example requires Chilkat v9.5.0.67 or greater.
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<body>
<%
success = 0

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

set http = Server.CreateObject("Chilkat.Http")

' Our folder path --> ID map will be stored in this hash table.
set folderMap = Server.CreateObject("Chilkat.Hashtable")

' 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"

set sbResponse = Server.CreateObject("Chilkat.StringBuilder")

' Begin by getting the top-level folders.
http.ClearUrlVars 
success = http.SetUrlVar("userPrincipalName","chilkatsoft@outlook.com")
success = http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/mailFolders",sbResponse)
If ((success <> 1) And (http.LastStatus = 0)) Then
    Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
    Response.End
End If

set json = Server.CreateObject("Chilkat.JsonObject")
success = json.LoadSb(sbResponse)
json.EmitCompact = 0

Response.Write "<pre>" & Server.HTMLEncode( "Status code = " & http.LastStatus) & "</pre>"
If (http.LastStatus <> 200) Then
    Response.Write "<pre>" & Server.HTMLEncode( json.Emit()) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "Failed.") & "</pre>"
End If

' This is our queue/stack of unprocessed folder ID's
' The recursive nature of this example is that we get the 
' child folders for each folder ID in the idQueue, which may
' cause additional ID's to be added.  We continue  until the idQueue
' is empty.
set idQueue = Server.CreateObject("Chilkat.StringArray")

set sbFolderPath = Server.CreateObject("Chilkat.StringBuilder")
set sbQueueEntry = Server.CreateObject("Chilkat.StringBuilder")

' Prime the map and idQueue with the top-level folders.
i = 0
numFolders = json.SizeOfArray("value")
Do While i < numFolders
    json.I = i
    folderName = json.StringOf("value[i].displayName")
    folderId = json.StringOf("value[i].id")
    success = sbFolderPath.SetString("/")
    success = sbFolderPath.Append(folderName)
    folderPath = sbFolderPath.GetAsString()
    success = folderMap.AddStr(folderPath,folderId)
    Response.Write "<pre>" & Server.HTMLEncode( folderPath & " --> " & folderId) & "</pre>"

    ' Push the folder path + id onto the idQueue.
    sbQueueEntry.Clear 
    success = sbQueueEntry.SetNth(0,folderPath,"|",0,0)
    success = sbQueueEntry.SetNth(1,folderId,"|",0,0)
    success = idQueue.Append(sbQueueEntry.GetAsString())
    i = i + 1
Loop

' Initial output:
' /Archive --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAG8XunwAAAA=
' /Deleted Items --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEKAAAA
' /Drafts --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEPAAAA
' /Inbox --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA
' /Junk Email --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEiAAAA
' /Outbox --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgELAAAA
' /Sent Items --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEJAAAA
' 

' Process the idQueue until it becomes empty.  This is the recursive loop.

Do While idQueue.Length > 0
    success = sbQueueEntry.SetString(idQueue.GetString(0))
    success = idQueue.RemoveAt(0)

    parentFolderPath = sbQueueEntry.GetNth(0,"|",0,0)
    parentFolderId = sbQueueEntry.GetNth(1,"|",0,0)

    success = http.SetUrlVar("id",parentFolderId)
    success = http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/mailFolders/{$id}/childFolders",sbResponse)
    If ((success <> 1) And (http.LastStatus = 0)) Then
        Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
        Response.End
    End If

    success = json.LoadSb(sbResponse)
    If (http.LastStatus <> 200) Then
        Response.Write "<pre>" & Server.HTMLEncode( "Status code = " & http.LastStatus) & "</pre>"
        Response.Write "<pre>" & Server.HTMLEncode( json.Emit()) & "</pre>"
        Response.Write "<pre>" & Server.HTMLEncode( "Failed.") & "</pre>"
    End If

    i = 0
    numFolders = json.SizeOfArray("value")
    Do While i < numFolders
        json.I = i
        folderName = json.StringOf("value[i].displayName")
        folderId = json.StringOf("value[i].id")
        success = sbFolderPath.SetString(parentFolderPath)
        success = sbFolderPath.Append("/")
        success = sbFolderPath.Append(folderName)
        folderPath = sbFolderPath.GetAsString()
        success = folderMap.AddStr(folderPath,folderId)
        Response.Write "<pre>" & Server.HTMLEncode( folderPath & " --> " & folderId) & "</pre>"

        ' Push the folder path + id onto the idQueue.
        sbQueueEntry.Clear 
        success = sbQueueEntry.SetNth(0,folderPath,"|",0,0)
        success = sbQueueEntry.SetNth(1,folderId,"|",0,0)
        success = idQueue.Append(sbQueueEntry.GetAsString())
        i = i + 1
    Loop

Loop

' The hash table of mail folder paths --> ID's can be persisted to XML and saved to a file or database (or anywhere..)
set sbFolderMapXml = Server.CreateObject("Chilkat.StringBuilder")
success = folderMap.ToXmlSb(sbFolderMapXml)
success = sbFolderMapXml.WriteFile("qa_data/outlook/folderMap.xml","utf-8",0)

' The hash table can be restored from the serialized XML like this:
set ht2 = Server.CreateObject("Chilkat.Hashtable")
set sb2 = Server.CreateObject("Chilkat.StringBuilder")
success = sb2.LoadFile("qa_data/outlook/folderMap.xml","utf-8")
success = ht2.AddFromXmlSb(sb2)

' What's the ID for the folder "/Inbox/abc/subFolderA" ?
Response.Write "<pre>" & Server.HTMLEncode( "id for /Inbox/abc/subFolderA = " & ht2.LookupStr("/Inbox/abc/subFolderA")) & "</pre>"

' Final output:

' /Archive --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAG8XunwAAAA=
' /Deleted Items --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEKAAAA
' /Drafts --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEPAAAA
' /Inbox --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA
' /Junk Email --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEiAAAA
' /Outbox --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgELAAAA
' /Sent Items --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEJAAAA
' /Inbox/abc --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAAA=
' /Inbox/xyz --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huwEAAAA=
' /Inbox/abc/subFolderA --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huwAAAQ==
' /Inbox/abc/subFolderB --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huwMAAAA=
' /Inbox/abc/subFolderA/a --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huwIAAAA=
' 

' ------------------------------------------------------------------------------------------------------
' 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.

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