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The default content access account is the account that is used to crawl content. This account can be overridden by specifying a different account by using a crawl rule. The account used to crawl content must have Read permissions for the content that the account is crawling. It is a best practice to limit the access of the account to read-only.
On the Search Administration page, under Crawling, click Default content access account.
On the Default Content Access Account page, in the Account box in the Default content access account section, type the domain and user name for the account (in the form domain\username).
In the Password and Confirm Password boxes, type the password for the account.