Hi, I'd like to know the best method or how other company's IT
purchase microsoft office softwares licensing? What is the best way? I
know there are a lot of online companies out there sells microsoft
office 2003 for really cheap, but I do not trust them. We have around
40 computers right now, Please Help
Thanks.

you might look into microsoft's partner program.

You should contact a computer reseller or CDW or Softwarehouse and ask
them about Microsoft's Open Licensing program (I think it's called
MOLP).

This allows you to purchase licenses at a discount because you're
buying them in bulk.  Then you purchase 2-3 copies of the CD-ROM
(usually under $10) and you deploy them.

Negotiate with the vendors, as each vendor has a different pricing structure/model.

Never buy from the "ultra-cheap" SPAMMers that try to taunt you with
$25 copies of office.  It's not legal, and in many cases, you won't
get usable software from them.

Besides, I'd never give a dime to a SPAMmer, as it would reinforce
their business model.

(I work as an IT Director for a 70 employee company)