When you open documents inside any of the Microsoft Office programs (like Word, Excel, PowerPoint), links to all these recently accessed files are added to the File menu.
It’s like a FIFO (first-in, first-out) queue – as you access new files, the older links get pushed down and eventually disappear as more documents get added to the list.
Now say you have an Excel Timesheet or a Word Status Report or some other document that you work on regularly.
Rather than hunting for such frequently used files on the computer, you can just pin them up permanently to the Recent Documents list and access the documents very quickly.
To pin documents, just click the grey pin icon next to the document. The color of the pin will change to green indicating that the document will always stay in your Recent Documents list until you un-pin it. The trick work only with Microsoft Office 2007.