You perform a crawl operation in Office SharePoint Server 2007 when a page is in draft version (0.x). Then, the page is published as major version (1.x). In this case, the published page is not picked up in later incremental crawls. Therefore, this page is not available in search results. This problem occurs when the default content access account has only “full-read” permission.
To fix this problem, apply the following updates:
978392 Description of the Office SharePoint Server 2007 Cumulative Update server hotfix package (Coreserver-x-none.msp): February 23, 2010
978389 Description of the Windows SharePoint Services 3.0 Cumulative Update server hotfix package (Sts-x-none.msp): February 23, 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.