After migrating a SharePoint 2007 farm to SharePoint 2010, you may find that the "Navigate Up" button is broken.  When clicked, rather than providing the expected breadcrumb/tree view, you receive "This page location is:".  To resolve the problem, open the site's default.aspx in SharePoint Designer and look for a line that reads:

<asp:Content ContentPlaceHolderId="PlaceHolderTitleBreadcrumb" runat="server" />

Remove the line, save the file and refresh the page.  The "Navigate Up" button should work properly now.

While looking at crawl log error messages on a SharePoint 2010 portal, I noticed that on each incremental crawl, roughly 38,000 errors were being reported. About 99% of these errors were "The object was not found". My initial thought was "Well, O' mighty SharePoint, why aren't you removing these items from the index after deciding they no longer exist?". Interestingly enough, there are search policies that dictate when objects that generate "access denied" or "file not found" messages get removed from the index.

The default delete policy for access denied or file not found errors is 30 errors in 30 days. The ErrorDeleteCountAllowed property dictates the maximum error count. The ErrorDeleteIntervalAllowed property dictates the timeframe, based in hours.  BOTH conditions must be met, otherwise the item is retried on the next crawl.

To view the configured values for these properties:

$sa=Get-SPEnterpriseSearchServiceApplication -Identity "Search Service Application Name"

To change the configured values:
$sa=GetSPEnterpriseSearchServiceApplication -Identity "Search Service Application Name"
$sa.SetProperty("ErrorDeleteCountAllowed", NewValue)
$sa.SetProperty("ErrorDeleteIntervalAllowed", NewValue)

NOTE: The ErrorDeleteIntervalAllowed value is hour based. The default is 720 hours, which equates to 30 days.

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