*Bulletin ID* A2E_215
*Last Review* 10/4/2010
*Revision* 1.0
*Previous IDs* None
*Obsoletes* None

Exchange 2003 Migration Leaves Legacy Mailboxes


When migrating mailboxes from Exchange 2003 to 2007/2010, the process may leave the mailboxes as “Legacy Mailboxes”, which do not have full capabilities under 2007/2010. This prevents Add2Exchange permissions from working properly in the new environment.

This can be fixed with an Exchange Management Shell command. The process to convert a single mailbox generally takes less than a minute.


  • Add2Exchange experiences logon failures to the mailboxes in question
  • The mailbox type in Exchange Management Console shows “Legacy Mailbox”


See the following Microsoft KB article for details:



Apply the solution to a test mailbox before doing a full migration:

  1. Select a test mailbox which:
    • is part of Add2Exchange synchronization
    • displays as a Legacy Mailbox in Exchange Management Console
    • can afford some downtime (the best is an inactive user or a test account)
  2. Run the following command and fill in “Old-Mailbox” with the user’s id:
    Set-Mailbox -id Old-Mailbox -ApplyMandatoryProperties
  3. Test that Add2Exchange now has access to the mailbox by running a sync or using the A2E Toolbox logon test.
  4. Once you have verified the solution, run the following command to update all legacy mailboxes:
    Get-Mailbox -filter { RecipientTypeDetails -eq “LegacyMailbox” } | Set-Mailbox -ApplyMandatoryProperties

Applies To

  • Exchange 2003
  • Add2Exchange Enterprise
  • Add2Exchange Standard