is there a free software/open software product like MS WORD's Microsoft Outlook.

I've tried SUNBIRD it has some serious limitations. However, it is free.

thank you.

StaticFX

www: OpenOffice.org - The Free and Open Productivity Suite

wait... you want a free email client? or word client?

for word/excel/etc get open office. email.... hmmm. not sure.

NeedKarma

Did you mean Thunderbird? That would be your first choice.
What limitations affect your decision?

edit to add: Evolution is now available for Windows: Download Evolution