You need to be assigned permissions before you can perform this procedure or procedures. What do you need to know before you begin? For additional management tasks related to user mailboxes, see Manage user mailboxes. This topic shows you how to customize storage settings for a specific mailbox instead of using the storage settings from the mailbox database. For more information about managing per-database mailbox settings, see Manage mailbox databases in Exchange Server. This means that the quotas configured for a mailbox database apply to all mailboxes in that database. Storage quotas are typically configured on a per-database basis.
When a mailbox reaches or exceeds a specified storage quota, Exchange sends a descriptive notification to the mailbox owner. Storage quotas let you control the size of mailboxes and manage the growth of mailbox databases. You can use the Exchange admin center (EAC) or the Exchange Management Shell to customize the mailbox storage quotas for specific mailboxes.
