When you post a message there is a checkbox over the buttons saying "Message is in HTML Format". Selecting that allows you to write in html.
If you save your word document as HTML you will then be able to copy the table's code and post it here.
Another alternative would be to share a google spreadsheet and embed it on your post. You would have to upload your spredsheet to google docs, share it and then embed it on your post.
When you share, you will be given an address with your document ID on it. It would be something like this:
https://spreadsheets.google.com/ccc?key=0AlYmTvJhHryXdGZOQUp3alBJZ0kxbTlMUEJnZjl0Ymc&hl=en
The bold code is the ID. Then you would have to post the embedding code replacing the ID:
<div><iframe src="https://spreadsheets.google.com/loadredirect?authuser=0&chrome=false&key=0AlYmTvJhHryXdGZOQUp3alBJZ0kxbTlMUEJnZjl0Ymc&output=html&pubredirect=true&widget=true" frameborder="0"></iframe></div>
The result would be something like this:
Nabble staff. We never ask for passwords.