Say you got tons of Excel sheets, PowerPoint presentations and Word
documents on your computer that were written in Office XP or 2003. How
do you convert all these files to the new Office 2007 format.

One option is that you open all of them in the associated Office
program and manually save them in the newer (docx, xlsx or pptx)
format. Or follow these steps and convert all documents in one go.

Step 1: Download Migration Manager kit and extract it into a new folder - say: c:\office.

Step 2: Download and install the Office Pack - this step is required even if you have Microsoft Office 2007 already installed on your computer.

Step 3: Assuming that you extracted the Office Manager files in
c:\office directory, go c:\office\tools, open ofc.ini using notepad and
add the following line.

fldr=c:\users\labnol\documents

This refers to the folder location that holds your office files. I
am pointing this to my Documents folder but it could be different on
your machine.

Step 4: Open command prompt and go to c:\office\tools. There
you’ll see a utility called ofc.exe - this is the Office File
Converter that will convert all old Office files to the new 2007 Office
document format in bulk. Run.

Immediately all old Office files in that folder (and sub-folders)
will get converted to the new format and are saved in a new folder.

This utility works with Word (doc to docx), Access databases,
PowerPoint (ppt to pptx), Visio diagrams, Excel (xls to xlsx) and
Microsoft Project files. The conversion may however fail for password
protected documents.