Vs and Office version choice for vsto add-ins

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VSTO

VS2015

hi,

i am working on app-level excel add-in. i have vs 2013 and office 2013. and i selected "Excel 2013 add-in" in the list. i have some questions at this point.



1- should i choose Excel 2010 add-in to widen my target users. when i choose 2010, will 2013-users(and/or upper version of office) be able to run it.

2- should i install 2007 version of office and 0ffice-2007-supporting version of VS, in order to even widen my target users, as VS2013 doesnt contain Excel-2007 option. or is there any other way like downloading a package which includes 2007 dll's etc

thanks