We are in the process of upgrading from Exchange 2007 to 2013, and I've moved all of the user mailboxes. The following mailboxes remain on the 2007 server and I wanted to check whether I should move these as well.
1. Launch IIS Process Account (IWAM_DNSXNY1@x.com)
2. Internet Guest Account (IWAM_XNYEXCHG@x.com)
3. Internet Guest Account (IWAM_XNYEXCH@x.com)
4. Evault Mapi (firstname.lastname@example.org)