Mailbox Migration with DB Limits

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.
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timgreen7077Exchange EngineerAsked:
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yes if the limits are there on 2016 DBs and while during migration from 2010 to 2016, mailbox migration will fail if mialboxes exceeds the limit permitted on 2016 databases.
Todd NelsonSystems EngineerCommented:
As Gaurav stated, a mailbox move will fail if the mailbox size exceeds the limit (quota) that is set on the target database.

Additionally, the mailbox sizes may increase as much as 20% when moving from Exchange 2010 to 2016.  Therefore, an Exchange 2010 mailbox that is 10 GB could increase in size to 12 GB once moved to Exchange 2016.

It's a good practice to either remove the quota or increase them well beyond the largest mailbox size during the transition (move) process.

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timgreen7077Exchange EngineerAuthor Commented:
Agreed, I figured that would be the case. Thanks for the replies gents.
timgreen7077Exchange EngineerAuthor Commented:
I figured that would be answer. thanks for the replies gentlemen.
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