No , you do not need MS Office to work with our Office Platform.
The following file formats are supported by Office integrator editor services.
Zoho Writer
doc - Microsoft Word Document
docx - Microsoft Word Document 2010+
rtf - Rich Text Format
odt - OpenDocument Text
htm - Hyper Text Markup
html - Hyper Text Markup Language
txt - Plain Text Document
Zoho Sheet
xls - Microsoft Excel Spreadsheet
xlsx - Microsoft Excel Spreadsheet 2010+
ods - OpenOffice Open Document Spreadsheet
csv - Comma Separated Values
tsv - Tab Separated Values
Zoho Show
ppt - Microsoft PowerPoint
pptx - Microsoft PowerPoint 2010+
pps - PowerPoint Slideshow
ppsx - PowerPoint Slideshow 2010+
odp - OpenOffice Open Document Presentation
sxi - OpenOffice.org Presentation File
File Size limitation: For writer and Sheet allow upto 10MB, For show allow upto 100MB