They now have Office 2016, combined that with what Frederick Weme said and saved the file to 97-2003 version
https://social.technet.microsoft.com/Forums/ie/en-US/d1f61f7c-5eb2-4c1b-9bd2-85a65ab05344/excel-there-isnt-enough-memory-to-complete-this-action?forum=officeitpro
https://social.technet.microsoft.com/Forums/ie/en-US/d1f61f7c-5eb2-4c1b-9bd2-85a65ab05344/excel-there-isnt-enough-memory-to-complete-this-action?forum=officeitpro
