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Introduction to Storage Quotas in Exchange 2010

Article Summary: Introduction to Storage Quota in Exchange 2010

Storage quotas are used by administrators to limit the amount of data stored by the Exchange server. There are two primary locations to set storage quotas for Exchange.

  1. Database: A quota set at the database level will apply to all mailboxes in that database. The exception to this rule is when an individual mailbox quota is set. The mailbox quota will always override the database quota.
  2. Mailbox: A mailbox quota is a limit set on an individual mailbox. Mailbox quotas always override database quotas.

There are 3 settings for storage quotas.

  1. Issue warning:

When this box is checked and a value set, the user will receive an email explaining he/she is approaching maximum mailbox size.

  1. Prohibit send: When this box is checked and a value is set, the user will not be allowed to send any emails once the threshold is reached. When a user, that is over the quota, sends an email it will be stored in the Drafts folder. The user will still be able to receive email unless the Prohibit send and receive quota is also set at the same level as the Prohibit send.
  2. Prohibit send and receive: When this box is checked and a value is set, emails sent to the user will bounce back to the sender with a 5.2.2 NDR (Non-Delivery Report). Any emails sent by the user will be stored in the Drafts folder. It is best practice to set this value slightly higher than Prohibit send to prevent NDRs

After a storage quota is set or changed it will take 15 minutes for the change to apply. To make the change immediate, restart the Microsoft Information Store service.

Here is a scenario to demonstrate how quotas would be applied by Exchange:

One mailbox database with the following quota set.

  • Issue warning at 4000 MB
  • Prohibit send at 5000 MB
  • Prohibit send and receive at 5200 MB

The following mailboxes are stored in the above mailbox database.

  • John.Kelly - use mailbox database defaults is checked
  • Sally.Smith - use mailbox database defaults is checked
  • Jerry.Xi - Prohibit send and receive is checked and set to 10000MB
  • Alex.Brown - use mailbox database defaults is checked

All users with the exception of Jerry.Xi would inherit the mailbox database quota. Jerry.Xi would be able to send and receive emails until he hit a mailbox size of 10000MB. It is important to note that quotas are all or none when it comes to inheritance. In the above example only the Prohibit send and receive box is checked. Jerry.Xi would not receive a warning at all since that box is not checked

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Article ID: SLN285979

Last Date Modified: 09/25/2014 01:18 PM

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