Exchange 2007 Mailbox enable process explained (4329431)

When running mailbox enabling process for exchange 2007 we use the following process:

- Find the user object
- Open the user object
- Disable the mail enabled user. We do this because you cannot mailbox enable an existing mail-enabled account. This removes all Exchange attributes, such as the legacyexchangedn. Note that if you did not run the merge process, because you had no connector created contacts, this process will fail because we will disable the mail enabled user. Because the user in this scenario will not be mail-enabled, it will fail so you must run the merge process regardless. This will bring over any of the target alias addresses and target address the user has from the source.
- Then we run a test to check the existence of the legacyexchangedn attribute. We do this to confirm it does not exist and that the object is not a mail-enabled object. This process loops until it confirms the deletion, and will wait for Active Directory replication to complete.
- When it is confirmed that the attribute does not exist, then the mailbox is created and enabled.