Forum Discussion
Cross Forest resource mailboxes
During a cross forest migration how can we have users access the resources mailbox calendars from each of the forest ? And also how can they share/access theirs free/busy availability ? thanks
It should work if you've run the prepare scripts for the cross forest mailbox migration provided by Microsoft. You'll need to set up an organisation relationship in both Exchange orgs for free busy
Hi Dan_Snape
I tried to run the prepare the room mailbox, with the prepare script, on the destination forest but it doesn't work.
Could you please elaborate your advice
You'll need to set up an organisation relationship in both Exchange orgs for free busy
How should I setup the Org relationship between the two Org considering they share the same smtp namespace ?
As per my reply to your other question, you'll need to configure alias SMTP addresses that apply to each each Forest, and these will be configured as the target address for the MEU that are created in the other Forest (ie Mailbox user in ForestA has primary email address of "user at contoso dot com" and an SMTP alias of "user at forestA dot com". The cross-forest prepare script creates an MEU for that user in ForestB with a primary SMTP of user at "contoso dot com" and a target address/SMTP alias of "user at foresta dot com". An organisational relationship is set up to in ForestB to "foresta dot com"
You then do this in reverse for free busy the other way.
You'll need to set up all the underlying DNS records and certificates to make this work prior to doing this as well.
Since the two exchange organizations are sharing the smtp namespace, we’re migrating forestA into forests, how can we set it up ?
to be more clear this is the config.
FOREST-A
smtp namespace domain.com
AD local namespace forestA.local
FOREST-B
SMTP namespace domain.com
AD local namespace ForestB.local
The preparation script do create ForestA’s users in forestB and that’s not an issue.
As per MS documentation to create an Exchange Organization Relationship first a Federation trust must be created on each On-prem to a tenant.
here my first doubt.
What happen if I run the federation wizard on both the exchange Org ? Does it creates a federation trust on the same tenant ? What about the fact they use the same smtp namespace ?
