Hi,

I am working on a migration-project where we migrate all users from one domain to a new domain. I have Exchange in both domains, and migrates mailoboxes from the old to the new domain. In the old domain I have a number of mailboxes that are used for common calendars for the departments. My problem is: How can I give the users who has been  migrated to the new domain full access to the existing calendar-mailboxex in the old domain? I have given the accounts in the new domain full access to the mailboxes in the old domain by using to following command: get-mailbox mailboxname | add-mailboxpermission -accessrights FullAccess,ExternalAccount -user newdomain\username

After the command has completed I can see the account listed in the "Manage Full Access Permission"-dialog, but still the new useraccount cannot create appointments etc in the original calendar from Outlook.

Any tips on

Check this out if this helps in your case. Above command has been provided for full access on mailbox i think you are looking specifically for calendar delegate permission access

https://gallery.technet.microsoft.com/ScriptCenter/19b98a56-42aa-4695-b07c-335d8322b64e/

All the best!!

Hi Thor,

Thank you for your question.

Did the issue occur when we use OWA?

Are there any errors when they cannot create appointments?

We could enable Support cross forest delegation on FIM(Forefront Identity Manager) to check if the issue persist.

There is an article for us to how to enable Support cross forest delegation by the following link:

http://blogs.technet.com/b/neiljohn/archive/2011/10/12/exchange-server-2010-cross-forest-delegation.aspx  

If there are any questions regarding this issue, please be free to let me know. 

Best Regard,

Jim