How often are warnings sent when you exceed your Storage Quotas in Exchange

In Exchange 2010 there is a setting for "Issue warning at", "Prohibit Send at", and "Prohibit send and receive at".  How often is there a warning sent in between the "Issue warning at" and Prohibit send at"?

Thanks
brendanosmithAsked:
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Gerwin Jansen, EE MVETopic Advisor Commented:
You should be able to see (and set) this in the Exchange Management console, tab Limits at Warning Message Interval (custom).
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Patrick BogersDatacenter platform engineer LindowsCommented:
Every time exchange is contacted (e.g. every time Outlook opens) it will issue the warning once the boundaries are reached.
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Adam FarageEnterprise ArchCommented:
Depends on what version of Exchange you are running, but in Exchange 2010 SP1 + (including Exchange 2013) the others would be incorrect.

In Exchange 2010 SP1 + there is a new attribute called "QuotaNotificationSchedule", in which a service (I believe its the system attendant) will run through all mailboxes to check if the mailbox is over quota. If the mailbox exceeds one of the three quotas, it will then send a message to the mailbox saying it is over quota, which is marked with high importance.

You can view this flag by running the following command:

Get-MailboxDatabase | Select Name, QuotaNotificationSchedule

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Older versions of Exchange would also check once a day, but not always when a client connects. Its just a tad bit more clear cut in Exchange 2010 SP1 as you can set when the quota is actually checked.
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