Exchange 2007 Legacy Mailbox to User Mailbox

For Systems (or Exchange Server) Administrator or Help Support (Helpdesk), if you "mistakenly" create a new mailbox user using Active Directory Users and Computer (ADUC), you will notice that the mailbox you created for that user is tagged/displayed in the Exchange 2007 Management Console as a legacy mailbox. You will loose some features of Exchange 2007 in this mode.

To fix this issue, you need to remove the legacy tag in Exchange 2007 by running the command below (in step 3) in Exchange Management Shell.

Note: This command can be directly performed on one of the Exchange Servers on your network/domain or from your desktop computer. Here, I am going to describe how to run the command from a client computer. If you are running from the Exchange Server box, then go directly to step 2.

1 -  Install Microsoft Exchange Management Tools from the Exchanger Server 2007 CD that will also install “Exchange Management Console” and “Exchange Management Shell” on the client computer (Windows XP or Windows Vista with SP1).

Note: Please note that installing Exchange Management Tools requires some steps to follow. If you are not familiar with the installation, I recommend you read this great article from MSExchange.org. It gives all the steps that will help you out with the installation.

2 - You must Log in as a domain Administrator or member of the domain admin group to be able to run the command

3- Click on Start --> Programs or All Programs --> Exchange Management Tools --> and select "Exchange Management Shell"

3- In the command line that opens, type or copy and paste the following command: Set-Mailbox -Identity "alias" -ApplyMandatoryProperties

4 - Just change "alias" with the mailbox name or the alias and keep the quotations on it.

Please let me know if this helps or if you find a better way of doing it.