Microsoft offers a tool called “adCenter Excel Add-in Keyword Research Tool” for versions 2003 and 2007, designed to help users figure out which keywords to use with their Pay-Per-Click (PPC) advertising campaigns. However, the tool’s output is also extremely relevant to developing or revising a keyword list for your website as part of an SEO update. Note: You’ll need to set up an adCenter account before you can use the tool.

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