Since Updating to Exchange 2007, our NDRs are coming from "Microsoft Exchange". We have been requested to modify this so that they arrive from postmaster@company.com. Is this doable?

Sounds like the postmaster account has not been configured on the 2007 server. Once you have this address configured and attached to a mailbox, you can change the display as you wish. This link should help you getting it set up: http://www.petri.co.il/creating-a-postmaster-mailbox-in-exchange-server-2007.htm Tim Harrington - Catapult Systems - http://HowDoUC.blogspot.com

A similar item is at http://www.howexchangeworks.com/2009/09/configuring-external-postmaster-address.html But it says on http://technet.microsoft.com/en-us/library/bb124238(EXCHG.80).aspx that this is just for exteranl DSN. Currently we have no ExternalPostmassterAddress, but we really want to modify this for internal users: We will probably turn off Exteranl NDRs; would like internal users to see a from address of our organization.

If we run http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/b1f47263-0545-492a-affe-4e7faa591aaf and Modify Microsoft Exchange with ADSI edit, will we cause havok & release the lesser hounds of confusion, yelling & finger pointing?

ADSI Edit: under: CNServices, CN=Microsoft Exchange, CN= YourRootDomain, CN=Transport Settings, open the properties of the "MicrosoftExchange238e...." object, change the display Name field to match the one you want.