Incorrect number of items for each keyword when you search for multiple keywords in mailboxes in an Exchange Server 2010 environment

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Symptoms

Consider the following scenario:

You perform a discovery search in mailboxes in a Microsoft Exchange Server 2010 environment.
You use multiple keywords to perform a search.
The number of the search results exceed 1000.

In this scenario, the server only reports 1000 search results.

Cause

This issue occurs because the maximum size that the content indexing engine can return is 1000, and the size is smaller than the call buffer size of 4096. Therefore, when multiple calls are sent to the content indexing engine for estimating, the store stops processing the calls when the size exceeds 1000.

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