I recently installed Office 365 and as a result it appears to have converted all of my old files to that format. The problem being I cannot email any of the excel spreadsheets as attachments as they will not open. I am using Windows Live Mail and sent a file to myself it just remains blank. How can I get around this? I still have the Excel 2007 why can't I just keep those files in that format? I only purchased Office 365 to get Publisher didn't need to mess with anything else.
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