Documents such as agendas, resume's, and meeting notes require no border. You can not only remove, but also insert borders in a few steps.
Step 1:
To start this process, click whichever row(s) that need formatting, or click the table selection tab shown in the picture below.
Step 2:
Once you have done this step, navigate to the table design tab on the quick access toolbar.
Step 3:
Next, you will hit the borders button that can be found under the table design tab.
Step 4:
After you have done this, simply click the rows that need added or removed borders, and select the applicable options.
Below is an example where all borders have been removed:
