All of our ~150 remote offices use a generic mailbox in addition to the local staff mailboxes. Due to a conflict with our new single sign-on product, the site staff are unable to access the generic mailbox. So we are creating a dedicated dynamic distribution list for each office, and the generic mail will be sent to that DDL.
That DDL needs to contain all the SMTP addresses previously contained in the generic mailbox, as well as the e-mail addresses for all other mailboxes in the same OU as the generic mailbox was located. I'm hoping to find ideas on how to automate this process. The old generic mailboxes will get exported to a PST and then deleted.