Mailbox & calendar sync collections can be populated with containers, groups, or users. When populating with containers, is it possible to then exclude certain mailboxes from the collection?
Yes this is possible. When a container is added as a member of the collection there are 3 tabs:
Scope - defines the OU where the mailboxes to be included must reside.
Storage - defines the server or mailbox store where the mailboxes to be included must reside.
Advanced - upon then selecting the "Edit..." button this enables an LDAP expression to be added to further define which mailboxes are included in the collection.
An LDAP expression to exclude 3 mailboxes from the collection with "mail" attributes set to firstname.lastname@example.org, email@example.com & firstname.lastname@example.org is given in the example below:
After adding the container to the membership of the collection & applying the required criteria select the "Preview" button to confirm the membership of the collection is as required.