How to Add an Exchange 2010 Custom Attribute using PowerShell
Every mailbox object in Exchange has a series of fields called custom attributes. These can be found by right-clicking on a mailbox in the Exchange Management Console, choosing properties and then clicking on the custom attributes button in the bottom right-hand corner of the window.
So you ask, what might I use custom attributes for? Within Exchange Role-Based Access Control (RBAC) there are some user-based policies which can use a unique custom attribute. Additionally, if you are going to setup custom Address Lists you may also want to base your list on a unique custom attribute.
Set Custom Attribute for multiple users: So in order to set this up, you will want to put together a similar PowerShell script; however, customize the file path to your environment and then save this as a .ps1 file. This should be run via the Exchange Management Shell.
As for the text file, be sure the names in your text file are formatted according to each user’s mailbox Display Name with as many names as you require. Then execute the script to modify the attribute of your choice. For example the text file format might be similar to what you see below, but again this should be based on the display name format within your organization: Lastname, Firstname Lastname, Firstname
Add a custom attribute for an individual user: Run the following command within the Exchange Management Shell
Note: In some cases I have seen an issue where $null did not clear the custom attribute. In this case “” was used instead.
The above article applies to the standard 15 custom attributes that come with Exchange 2010 and does not apply to any of the newly added custom attributes.
Theresa is a Sr. Technical Systems Administrator and has been working as a technical expert in IT for over 18 years. Theresa has her MCSE, CCA and EPIC ECSM certifications. Her areas of expertise are in the areas of Exchange, Active Directory, Lync, SharePoint and Citrix XenApp. She has architected, designed, implemented and led complex projects in all of these areas. She also is a public speaker, speaking at events such as Briforum 2013 and upcoming will be at E2E Virtulization conference in May 2014. She can be found on Twitter @24x7ITConnect and her personal blog is 24x7ITConnection.wordpress.com.