View Office Open XML Files as HTML in Gmail and Google Search Results

Google now support Microsoft's Office Open XML formats in Gmail and web search and let you view as HTML documents created using Microsoft Office 2007: .docx documents, .xslx spreadsheets and .pptx presentations. Google Docs doesn't yet support importing Open XML files, but you can use online services like Zamzar, Zoho Writer or software like OpenOffice 3.0, Microsoft Office 2007 or Microsoft Office Compatibility Pack to convert your files.

Source:→ Google System