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Understanding Quota Messages

Exchange 2010
 

Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2

Topic Last Modified: 2011-10-13

A quota message is an e-mail message that's automatically sent by Microsoft Exchange to the owners of a mailbox or a public folder when a size limit (called a storage quota) for the mailbox or public folder is exceeded. You can use the New-SystemMessage, Get-SystemMessage, Set-SystemMessage, and Remove-SystemMessage cmdlets in the Exchange Management Shell to view built-in quota messages or to create, view, modify, or remove customized quota messages.

Exchange 2010 SP1 introduces a flag that controls whether a mailbox is checked to see if its size is equal to or greater than 50% of the Prohibit send quota.As a result, if the Issue Warning quota is set to a value less than 50% of the Prohibit send quota, the warning message associated with the Issue warning quota won’t be sent to the user. For example, if a mailbox has a size limit of 10 MB, and you set the Issue warning quota to 3 MB and the Prohibit send quota to 8 MB, the user won’t ever receive the warning specified by the Issue warning quota because the Issue warning quota limit isn’t equal to or greater than 50% of the Prohibit send quota. Instead, the user will receive only the message associated with the Prohibit send quota (in this case, when the user’s mailbox size reaches 8 MB).

In addition, the flag is cleared after you run the Set-MailboxDatabase cmdlet with the QuotaNotificationSchedule parameter. When you run that command, the mailbox won’t be checked again until the flag is reset. Flags are reset when a message is saved in the mailbox or when a message is sent to or from the mailbox.At that point if the mailbox size is greater than 50% of the Prohibit send quota, the flag is reset and the mailbox is checked at the time specified by the QuotaNotificationSchedule parameter.

A storage quota is a storage size limit for a mailbox or a public folder. You can use the Exchange Management Console (EMC) or the Shell to view or set the storage quotas for all of the mailboxes or public folders in a database. You can also use the EMC or the Shell to set storage quotas on a per-mailbox basis, thereby overriding the storage quotas that are set at the database level. However, storage quotas for individual public folders can be viewed or set only in the Shell.

For more information about viewing and configuring storage quotas, see the following topics:

By default, Exchange sends a quota message to mailbox or public folder owners when a:

  • Mailbox, personal archive, or public folder exceeds its Issue warning limit (the lowest storage quota).
  • Mailbox exceeds its Prohibit send limit or a public folder exceeds its Prohibit post limit (the middle storage quota).
  • Mailbox exceeds its Prohibit send and receive quota or a personal archive exceeds its archive quota (the highest storage quota).

Quota messages for mailboxes are sent to mailbox owners. If a mailbox is owned by a security group (that is, if it's a shared mailbox), quota messages are sent to the security group. Quota messages for public folders are sent to every public folder owner. Owners of mailboxes and public folders can be users, contacts, or security groups.

Quota messages are sent with high importance and aren't subject to storage quotas. They're always delivered, even if the recipient's mailbox is full.

Exchange can generate quota messages in many languages. For a list of the supported language locales that are available for use with quota messages, see Supported Locales for Use with System Messages.

There are seven types of quota messages: four for mailboxes and three for public folders. All quota messages include the following:

  • Text Microsoft Exchange in the From field
  • Brief, non-customizable description of the situation in the Subject field
  • Customizable message in the message body
  • Graphical representation of the storage quota and the amount of storage used in the message body (except for mailboxes or public folders of unlimited size)

The following tables list the subject and the default message text for the seven default English quota messages (four for mailboxes and three for public folders). The default message can be customized, but the subject text can't.

noteNote:
There are no specific archive quota messages. If a user's archive is meeting or exceeding any quotas, they will receive mailbox quota messages.

Mailbox quota and archive quota messages

Event Subject of message Default message text

Mailbox of unlimited size exceeds its Issue warning quota

Your mailbox is becoming too large

Please reduce your mailbox size. Delete any items you don't need from your mailbox and empty your Deleted Items folder.

Mailbox of limited size exceeds its Issue warning quota

importantImportant:
The message associated with the Issue warning quota won’t be sent to the user unless the value of the quota is greater than 50% of the value specified in the Prohibit send quota. For example, if you set the Prohibit send quota to 8 MB, you must set the Issue warning quota to at least 4 MB. If you don’t, the Issue warning quota message won’t be sent.

Your mailbox is almost full

Please reduce your mailbox size. Delete any items you don't need from your mailbox and empty your Deleted Items folder.

Mailbox of limited size exceeds its Prohibit send quota

Your mailbox is full

Your mailbox can no longer send messages. Please reduce your mailbox size. Delete any items you don't need from your mailbox and empty your Deleted Items folder.

Mailbox of limited size exceeds its Prohibit send and receive quota

Your mailbox is full

Your mailbox can no longer send or receive messages. Please reduce your mailbox size. Delete any items you don't need from your mailbox and empty your Deleted Items folder.

Public folder quota messages

Event Subject of message Default message text

Public folder of unlimited size exceeds its Issue warning quota

Your public folder is becoming too large

Please reduce the size of your public folder by deleting any items you don't need.

Public folder of limited size exceeds its Issue warning quota

Your public folder is almost full

Please reduce the size of your public folder by deleting any items you don't need.

Public folder of limited size exceeds its Prohibit post quota

Your public folder is full

Users can no longer post items to this folder. Please reduce the size of your public folder by deleting any items you don't need.

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