Skip to main content

Mailbox Automapping forward and reverse map using Autodiscover and PowerShell

Auto-mapping was a feature that was introduced in Exchange 2010, where when you added Mailbox access permission via Add-MailboxPermission, Outlook would automatically add that Mailbox as an additional Mailbox. Outlook uses Autodiscover to get the information on these mailboxes that are auto mapped via the AlternateMailboxes user setting eg in XML it comes back like the following


One thing you can't see easily via the Exchange Managed Shell cmdlet is which ACE's (Access Control Entries) have Automapping enabled on a particular Mailboxes DACL and which don't. You also can't easily see from one mailbox which mailboxes will be auto mapped to it (basically a reverse mapping).So the purpose of this script is to provide both a forward and reverse mapping of Automapping setting for a collection of Mailboxes that are passed into to. It produces a report that look like




To get this collection you can either use a CSV file of addresses, Get-Mailbox or just a static list.

Eg to run the script using Get-Mailbox

create a blank collection
$Mailboxes = @()

populate the collection
Get-Mailbox -ResultSize Unlimited | foreach-object{$Mailboxes += $_.PrimarySMTPAddress}

then run the script like

 Get-AutoDiscoverMailboxMap -Mailboxes $Mailboxes

The report is outputted in the last line of the script.

I've put a copy of this script on GitHub here https://github.com/gscales/Powershell-Scripts/blob/master/AutoDiscoverMap.ps1

Popular posts from this blog

The MailboxConcurrency limit and using Batching in the Microsoft Graph API

If your getting an error such as Application is over its MailboxConcurrency limit while using the Microsoft Graph API this post may help you understand why. Background   The Mailbox  concurrency limit when your using the Graph API is 4 as per https://docs.microsoft.com/en-us/graph/throttling#outlook-service-limits . This is evaluated for each app ID and mailbox combination so this means you can have different apps running under the same credentials and the poor behavior of one won't cause the other to be throttled. If you compared that to EWS you could have up to 27 concurrent connections but they are shared across all apps on a first come first served basis. Batching Batching in the Graph API is a way of combining multiple requests into a single HTTP request. Batching in the Exchange Mail API's EWS and MAPI has been around for a long time and its common, for email Apps to process large numbers of smaller items for a variety of reasons.  Batching in the Gr...

Exporting and Uploading Mailbox Items using Exchange Web Services using the new ExportItems and UploadItems operations in Exchange 2010 SP1

Two new EWS Operations ExportItems and UploadItems where introduced in Exchange 2010 SP1 that allowed you to do a number of useful things that where previously not possible using Exchange Web Services. Any object that Exchange stores is basically a collection of properties for example a message object is a collection of Message properties, Recipient properties and Attachment properties with a few meta properties that describe the underlying storage thrown in. Normally when using EWS you can access these properties in a number of a ways eg one example is using the strongly type objects such as emailmessage that presents the underlying properties in an intuitive way that's easy to use. Another way is using Extended Properties to access the underlying properties directly. However previously in EWS there was no method to access every property of a message hence there is no way to export or import an item and maintain full fidelity of every property on that item (you could export the...

EWS Create Mailbox folder Powershell module for Exchange and Office365 Mailboxes

This is a rollup post for a couple of scripts I've posted in the past for creating folders using EWS in an Exchange OnPremise or Exchange online Cloud mailbox. It can do the following Create a Folder in the Root of the Mailbox Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test Create a Folder as a SubFolder of the Inbox Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Inbox' Create a Folder as a SubFolder of the Inbox using EWS Impersonation Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Inbox' -useImpersonation Create a new Contacts Folder as a SubFolder of the Mailboxes Contacts Folder Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -ParentFolder '\Contacts' -FolderClass IPF.Contact Create a new Calendar Folder as a SubFolder of the Mailboxes Calendar Folder Create-Folder -Mailboxname mailbox@domain.com -NewFolderName test -Parent...
All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.