Microsoft will retain the data on a mailbox for 30 days on an unlicensed user account.
TIP: If you need to retain the data for an unlicensed user you can convert the user into a shared mailbox and then remove the license from this account.
As long as this account doesn't grow over 50GB, you will not need a license for it.
If you need to reconvert a shared mailbox into a normal user account, make sure you have a spare license assigned to the account before starting the process.
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