GTD is not focused on particular tools, so no. Threads sometimes start out about one tool but discussion can be widely ranging. Feel free to ask for information and opinions.
I don't know where you live, but we have a quite active community here in Denmark, where we arrange meetups, discussing everything GTD, including sharing experiences with our setups on different tooling.
I have to say that the Outlook Setup guide was awesome and I am able to use Outlook and OneNote as a pretty comprehensive system with Tasktask connected to my Outlook Tasks for use on the go as it keeps categories/contexts unlike ToDo or the iPhone Reminders app.