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Trouble with selecting users for grat premission

Posted By:      Posted Date: September 07, 2010    Points: 0   Category :SharePoint
Hi,   I have SharePoint 2010 and AD with aprox. 5000 users, when I try to add site premission I cannot find some of the users in the "Select People and Groups" window. There isn't such a problem in the our test system AD with 20 users.

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