During last year, an internet friend of mine asked for my suggestion on 
how to convert word document into PDF as he wanted to write an e-book using Microsoft Word. I suggested him a few ways I know and he was quite satisfied with the result.
Without further ado, let’s check the solutions available for you to convert your doc file to PDF format.
Using Online Conversion Tool
Onlin conversion services such as Zamzar.com let you convert your DOC file to PDF for free. You just need to upload your DOC file, and then they will send you the PDF version of the file diectly to your e-mail.
Using Adobe Acrobat Reader
EnterpriseDT.com has created a tutorial on how to convert Microsoft Word documents to Adobe’s Portable Document Format (PDF) using Adobe Acrobat Reader which you can find here. The steps are quite long, but I believe that in return, you will get a good skill using the software.
Using Open Office.org
Love and use Open Office? You probably know that this free office suite has DOC to PDF conversion utility. The installation file is quite big if you want to download the office suite but fortunately, there is a portable version of Open Office which you can run in any pc with Microsoft Windows Operating System. Download Open Office Portable (69.5MB)
You might ask: How about if I want a specialize software for the file conversion..?
PrimoPDF which is free is there for you (13.19MB). 
August 10th, 2007 at 9:59 am
Great Info. I wrote a similar post, Convert PDF Files for Free, that also give the option of converting files from a widget in your igoogle homepage.
August 10th, 2007 at 12:08 pm
I use OpenOffice, and it works quite well. The PDF export for Mac’s Pages application does a great job, too.
DevDad
August 10th, 2007 at 8:19 pm
DevDad: Thanks for the opinion.
August 13th, 2007 at 6:59 pm
I’m using PrimoPDF it’s quite good and moreover it’s free
December 21st, 2007 at 4:29 am
Ehhhh no, i think that these tools aren’t helpful at all.
It only steals private information.
The question is:
Will be these files really deleted?
JA! nop.
And later you’re asking yourselves “How did they found about it”
The answer is:
You gave it for free.
January 18th, 2008 at 8:50 am
how to convert from pdf to doc file,free software..plsss
February 20th, 2008 at 2:30 am
Yeah PrimoPDF is rock solid, have been using for sometime already. Now the Primo have a feature to allow you to append print out to your existing PDF.
March 28th, 2008 at 8:17 pm
please how can i convert a word doc to pdf please urgent i tried all the ways but didnt work
thank you