When a database is created, the database MUST be assigned a new randomly generated REPLGUID. When the REPLID and REPLGUID to-and-from mapping table is created, a single new entry MUST be added, consisting of the database REPLGUID and a newly assigned REPLID.
When a database is restored from backup, the server MUST take steps to ensure that it does not re-issue a REPLGUID that was issued prior to the restoration. These steps are implementation-specific. <15>
When a mailbox is created, the following entries MUST be added to the Receive folder table for the new mailbox:
"" (empty string) – Inbox in the new mailbox
"IPM" – Inbox in the new mailbox
"Report.IPM" – Inbox in the new mailbox
"IPC" – Root folder of the new mailbox