Hey,
According to the Tut Letter, you need keep a separate page as part of your website (portfolio) containing all your forum posts, so yeah you can keep it in Microsoft Word if you want, I just keep mine in notepad.
But obviously when you make your portfolio and you add in your forum posts, you are most likely going to stick it into whatever text editor (still notepad++ in my case) you use to create your html code in for your website.
So basically, just make sure it's all store so that when you're ready to display it, you have it freely available for yourself
Hope this is the right response
And I hope it helps.