Frontpage form advice needed

I need to set up a form using FrontPage 2000 to use as an intranet survey. About 6000 people are going to be sent the link to the form and asked to complete the survey which consists of about 10 simple questions with answers being given via tick boxes or radio buttons. One of the fields will also be a comments box.
I want to use the send results to a text file option, which I have used in the past on the same server without any problem for a couple of hundred users in total. My concern this time is the number of submissions being thousands rather than hundreds. Are there any problems I should be aware of using this method, such as if several hundred people try to submit the form at the same time.