Question: Do I have to remove MS Office to download/use Star Office 7? 

Answer: No.  They will work independently of each other.\n\nThe one thing you might find is when you install star office it might want to take the file associations from MS Office.  Meaning if you double click on a .doc file, Star Office will try and open it.\n\nYou can usually disable that option when you are installing Star Office.\n\nEven if you forget to do that, you can still open MS Office and then open the file via FIle --> Open
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