Is there any danger in removing Full Mailbox Access for Domain Admin, Exchange Admin or Administrator?

By default, administrators are denied maiulbox access in Exchange 2003, so at some point someone explicitly set it per: http://support.microsoft.com/kb/821897/ How to assign service account access to all mailboxes in Exchange Server 2003 So, if you undo wherever that was set, you'll actually be setting it back to the default. However, be very careful when undoing that so that you do not remove any permissions for any built-in Exchange security groups.

HiYou also could refer to below link:http://technet.microsoft.com/en-us/library/bb124053(EXCHG.65).aspxRegards!gavin