We have an exchange 2003 servers co-existing with exch.2007 servers. I'v tried to create with success a user with mailbox on exchange 2007 server by using an exchange 2003 ADUC console - it seems for me more comfortable then using an exchange 2007 one. On the first look such account exists well. So why cant i just continue to use an exch.2003 console to create and manage mailboxes after complete migration to exch.2007? Any caveats?

Hi, Yes, you need to use EMC/EMS to create/manage Exchange 2007 mailboxes, those MUST NOT be managed by ADU&C because it doesnt stamp some of the mandatory properties of Exchange 2007 and you will see it as a legacy mailbox in EMC. Or you need to run Set-Mailbox command with ApplyMandatoryProperties switch to apply mandatory properties manually after creating users with ADU&C. Some of the articles are here for your reference. Amailbox that is located on an Exchange Server 2007 server may be identified as a legacy mailbox in Exchange Server 2007 http://support.microsoft.com/kb/931747 ApplyMandatoryProperties http://blogs.technet.com/evand/archive/2007/02/28/applymandatoryproperties.aspx Exchange Server 2007 and 2000/2003 systems management co-existence http://msexchangeteam.com/archive/2006/10/09/429135.aspx