When I open a workbook in SP2010 in xlsviewer.aspx I can see that there is a "edit in browser" button
However when I open a workbook in SP2013 with xlsviewer.aspx I can see that there is no button to edit in the browser.
Why did this button disappear?? why is the xlsviewer.aspx behaving differently in SP2010 and SP2013.
This can't be that whole Excel Web Apps vs Excel Services nonsense because I believe that Excel Web App uses something called wopiframe.aspx.
So has some functionality been removed from Excel Services?
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