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Exchange Quota Warnings and restrictions

Posted on 2013-01-30
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Last Modified: 2013-02-01
Hello,

When are users warned that they have exceeded their quota? The warning does not seem to happen right away.

I created a test by importing a 2Gb PST into an account that has a 1GB limit.

Then, I logged out and logged back in. I was not warned about exceeding the quota limit.

So, I rebooted the server. Now, when I log in as a user I am given a message that I have exceeded a quota. Why is there a delay and why doesn't Exchange stop the user from importing data when they have exceeded the quota? What am I missing and how does the quota system work?

Thanks,
John
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Question by:jhieb
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EMJSR earned 500 total points
ID: 38837763
It will take around 2 hours for the quota changes to take effect. That is because the Exchange Information Store service is responsible for enforcing mailbox size limits and it uses a cache that holds active information; any changes are not live until that cache is refreshed, and well, the default is 120 minutes.
 
There is a registry value, I believe, that can be modified in order to change this default value. I would need to know the exact Exchange server version so I can provide you with the correct key, in case something has changed between versions; I don't know that off the top of my head right now.

There maybe an increased processing overhead if you lower the interval, but probably not by much.
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by:jhieb
ID: 38837775
I am running Exchange 2010 from SBS 2011. The exact version is 14.02.0247.005

Thanks for the information. It helps. Do you know why Outlook will let me import data even though it is over the Exchange limit? Does Exchange expect me to close the session before it will give me a warning?
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by:EMJSR
EMJSR earned 500 total points
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Well, you could try and close the session, but since the default cache refresh is 2 hours, it will most likely still allow you to keep using the old quota during that time frame regardless.

Please have  a look at the following two links; they will explain in detail what you need to change. The changes for 2010 are the same as for 2007 as far as I can see:

http://theessentialexchange.com/blogs/michael/archive/2008/01/18/Exchange-Server-Caches.aspx

http://technet.microsoft.com/en-us/library/aa998353.aspx
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by:jhieb
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Thanks.
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by:EMJSR
ID: 38838005
You're welcome. If you have any further questions, please don't hesitate!
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