Forum Discussion
Exchange Hybrid - GAL Multiple Forests
How does the GAL work with a Multi Forest Hybrid Environment? I can't find anyone else directly asking this.
Exchange 2010 hybrid in CompanyA Domain and same in Company B. Trusts will exist between both domains.
How do you make sure all users see all addresses? Is this automatic or ?
Do they share a tenancy? if so Azure AD connect will populate the tenancy with the users from both domains.
If they have separate tenancies you need to perform a contact synchronisation across your two domains (on-prem) using something like Microsoft Identity Manager (MIM) this is licensed by EMS E3 if you have that SKU.
One tenancy, will it work in reverse as well, will both on prem systems end up see the other on prem server's users?
No it will not sync back, you need MIM or some other method of contact sync
