The default limit is 100 items in an Exchange 2007 OWA search, if you try to search for something that has more than 100 results it will only display the first 100.
Change the default search limit in OWA 2007
You can change this by modifying the the web.config
The default location is: C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\ web.config
Look for the following entry and adjust.
<add key="MaximumIdentityArraySize" value="100" />
And adjust the values to whatever you want, but keep in mind that could have a performance impact on the CAS if there is high use of large queries
Troubleshooting Exchange 
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OWA 2007 Search only displays the first 100 results.
Does this really work? Every other discussion I found on this topic said we’re stuck at the 100 limit.
I changed the MaximumIdentityArraySize value in the web.config file to 500 then restarted IIS, but I still only get 100 items returned in a search. Are there any other steps that should be taken?
Chris
Yeah I verified in my lab environment as well as having a customer implement, I dont write up an article unless i have first hand experience with it.
I havent tried it with the latests updates, I will do that and provide feedback, its quite posible they changed the behavior.|
What SP and RU versions are you running?
Thanks for your reply,
We’re on SP2, not sure what RU.
About Exchange Server 2007 says Version 08.02.0301.000
From the command shell the command >get-exchangeserver | fl name,edition,admindisplayversion
returns:
Name : MAIL
Edition : Enterprise
AdminDisplayVersion : Version 8.2 (Build 176.2)