My current project is using MIIS to assist with an Exchange Resource Forest. The company has decided to run Exchange in the headquarters and each sub-Company would maintain their own Active Directory for login and security. The Exchange forest has placeholder accounts (mailboxes) that the external accounts have rights to.

MIIS is responsible for two things:

1. Synchronize the GALs from each sub-company to the central Exchange Resource Forest.
2. Provision mailboxes when ne