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You can easily configure this through the Exchange Management Console, which you access through the administrative tools of Exchange Server. To see what your mailbox configuration is currently from the navigation panel, open up “Microsoft Exchange On-Premises” > “Organization Configuration” > “Mailbox”. That should bring up the list of mailbox databases, right click your database and choose properties, and the properties box will pop up. Choose the “Limits” tab, and you can choose the storage limits in KB for your users. You can also decide how strict you want to be when the limit is his, from a nice little warning to prohibiting the user from either sending or receiving messages until the offending mailbox size is brought back down under your limits.