Exchange global address not updating

GAL segmentation allows one to create an appearance of hosting multiple independent email organizations within the same Office 365 tenant.Administrators can create multiple address books and global address lists and filter them to only the specific contacts/mailboxes/groups.This might cause confusion about their actual state.

The approach is the same as above: we need to create 1) resource address list, 2) mailbox address list, 3) GAL 4) offline address book based on GAL, then 5) create a new address book policy combining the 4 elements above, and finally 6) assign the new address book policy to mailboxes, which in this case have a certain string in the “Office” attribute.First, get the guid of the Office 365 group that was used for address book filtering: Guids will be displayed in the left column. Substitute “GUID” with the actual GUID, you don’t need to use single or double quotes around the GUID for this to work.This command grabs object IDs of all members of our test group, gets their associated mailboxes, and pipes them into commandlet that assigns the new address book policy.This next post is going to talk in detail about GAL segmentation setup in Office 365.The original idea was borrowed from this Microsoft blog post, but since not all of the steps were covered there in sufficient detail, I am expanding them here, and adding two specific examples: how to segment GAL based on distribution lists membership, and how to segment GAL based on Office attribute.

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