I don't remember that detail, but I do remember most people not treating their inbox as an archive at the time. So there was less friction to switch to gmail, and more reason to do so due to the "real time" ticking storage amount of gmail, which then became an archive (again for most people).
> I do remember most people not treating their inbox as an archive at the time.
Indeed. For me, the step was gmail. With its humongous 1GB of storage, that was the moment when I stopped having to delete stuff to save space. It’s funny because a lot of people I know who were already older at that point kept the habit of deleting emails, even today.