If you’ve upgraded to Microsoft Office 2007 and your friends and colleagues haven’t, they will not be able to open the Office files you create and send to them.
There are a couple of ways to avoid this issue:
1. For files you’ve already saved, re-save them using the SAVE AS feature and change the file format to Word 97-2003 Document.
2. Change the default file format for all new files you create – go to WORD OPTIONS, click SAVE from the menu and change the “save files in this format” from Word Document (*.docx) to Word 97-2003 (*.doc).
To send your files to someone who doesn’t use Microsoft Office, follow the above instructions and select the applicable file format rather than Word 97-2003.