| Microsoft Office Web Components (OWC) is a collection of Component Object Model (COM) controls used by earlier versions of Microsoft Office for publishing spreadsheets, charts, and databases to the Web, and for viewing the published components on the Web. OWC was removed from the 2007 Office release in favor of improvements to the Web features of Office desktop applications and of Microsoft Windows SharePoint Services. Organizations that currently support publishing data to the Web via OWC and are not ready to migrate to newer publishing methods can download OWC from Microsoft and continue to use it with 2007 Microsoft Office applications.
By default, when users save workbooks as Web pages that use OWC, Excel maintains externally referenced data of formulas that are not in the selected range to be published, which increases the size of the files and in some cases increases the risk of exposing sensitive information. The user can change this functionality by clearing the Save any additional hidden data necessary to maintain formulas check box on the General tab in the Web Options dialog box (available from the Advanced section of the Excel Options dialog box). If the check box is cleared, Excel 2007 replaces the formulas with calculated values, which reduces the size of the file.
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