The Word 2007 and 2010 by default saves the document in the docx format which means the docx file can be easily be opened from 2007 / 2010 version .
There are also other options for opening the doc/ docx file . Assume you give the doc file to your friend who doesn’t have the Office version installed on his machine and wants to view the document .
Here are some list of App that lets you view the word file even if Office 2010 / 2007 is not installed
Google Docs allows you to upload / view and even edit the document . Note that you might need a valid gmail id to use this function.
2. Word Viewer 2007
This software from Microsoft is meant for viewing the word document which means you will be able to open the document but will not be able to edit them .
It also allows to open the following files docx,docm,rtf,txt,.htm, .html, .mht, .mhtml,wpd,.doc, .wpd,wps,xml and requires Compatibility pack for opening .docx files.
3. Open Office
OpenOffice is a open source office software suite that provides much the similar functions like the Office and free too .
You can open , view and even edit the word documents with Open Office .
4. Zoho Viewer
Another Online tool for viewing the documents
5. TextMaker Viewer 2010
A free desktop App from SoftMaker to view the word document . TextMaker Viewer 2010 enables the users to Open , View and Print the following file formats .docx, .docm ,dotx, .dotm, .doc , .dot, .tmd , .tmv , .odt , .ott , .sxw , .rtf , .psw , .pwd , .htm, .html ,.txt