Excel "Share Workbook" should not make some functions unavailable
 

Once you make your Excel workbook "Shared" by selecting "Tools Share
Workbook", some tools or functions are not available, such as Drawing and
Merge cells. Also, you can delete the workbook while it is open.

I do not think these changes are reasonable or necessary.

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http://www.microsoft.com/office/comm...lic.excel.misc