Can I delete the Legacy SystemMailbox

if exchange 2003 was removed then they should have been deleted with.
Exchange 2010 do have its own system mailboxes so if you are sure you are talking about 2003 ones yes you can delete them

if they are not taking space just keep them

Hi,
Exchange 2010 has own system mailbox. If you have successfully migrated from 2003->2010 then you can delete them. You can not take care abou Legacy System Mailboxes.

I have attached an image of the Exchange Management Console under Recipient Configuration.

I am fairly certain these are Legacy accounts and no futher function, but I am nervous about removing them.  Is there an yweasy way to deactivaate them to make sure they are not used before deleting them?  When I tried to deactivate, you get all kinds of warnings that you will looze the settings.

 

how are you still having legacy mailboxes if you removed your 2003 ?

I assume they were copied over with the rest of the mailboxes when I did the transition.  I can't remember how I did it, but I assume there was a wizard that came with Exchange 2010 to do that.