I'm running mailbox migrations from Exchange 2010 to 2016, on the 2016 DBs I have hard limits set for send/receive and warnings. On the mailboxes they are set to use the database defaults, but a few I have manually send/receive settings added so that they override DB restriction and allow the mailbox to accept more mail than what the DB allows. I'm sure that those mailbox settings carry over during the migration, but I'm wondering if those mailboxes are larger than the allowed size I have set on the 2016 DBs will the migration fail or not. I can test this but I thought I would see if anyone have an answer on this first.
Example. I have a 2010 mailbox with 10GB and these settings on set on the mailbox. I will migrate to a 2016 DB with a 5GB limit set on the DB. Will this migration be successful since the mailbox settings carry over, or will it fail because even though the settings care over, its currently moving to a 2016 DB with a smaller limit.