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After you upgrade to Microsoft Exchange Server 2010 Service Pack 1 (SP1), some users no longer receive quota warning messages even though their mailbox size is over the quota warning threshold.
The way that quota warning messages are generated changed in Microsoft Exchange Server 2010 SP1. Before SP1, all mailboxes on a server are checked during the quota warning schedule to see whether the mailbox size exceeds the quota warning threshold. If the mailbox size exceeds the threshold, a quota warning message is created for that mailbox.
In SP1, a new flag was introduced that controls if a mailbox is checked to see whether its size exceeds the set warning threshold. This flag is set on a mailbox if the mailbox size is equal to or more than 50 percent of the Prohibit Send quota.
Therefore, if the warning quota is set to a value that is less than 50 percent of the Prohibit Send quota, the mailbox size can be over the warning quota limit but still not over 50 percent of the Prohibit Send quota. In this case, the mailbox is not checked to see whether it has exceeded its threshold, and the mailbox does not receive a quota warning message.
Consider the following scenario. You have a size limit of 10 megabytes (MB) that is set on your mailbox, and you set your Prohibit Send quota to 8 MB. Therefore, the user can no longer send any email messages after he or she hits that 8 MB limit. However, the user can continue to receive mail up to the 10 MB limit. In this scenario, if you set your Warning Quota to 3 MB (notice that 3 MB is less than 50 percent of your Prohibit Send quota), the warning is not sent.
In addition, after a mailbox has been checked during the database QuotaNotificationSchedule, the flag is cleared. This means the mailbox is not checked again until the flag is reset. The flag is reset when either a message is saved in the mailbox or a message is sent to or from the mailbox. At that point, if the mailbox size is more than 50 percent of the Prohibit Send quota, the flag is reset, and the mailbox is checked during the next time slice of the QuotaNotificationSchedule.
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To resolve this issue, follow these steps:
If an administrator has to see whether mailboxes are over Warning, Prohibit Send, and Prohibit Send and Receive storage limits, the administrator can increase diagnostic logging by following these steps:
Note To see the QuotaNotificationSchedule for each database, run the following command:
Get-MailboxDatabase | fl Name, QuotaNotificationSchedule
For more information about quota messages in Exchange Server 2010 SP1, visit the following TechNet website: