If you're of a certain age, you'll remember the frisson of excitement around the launch of Gmail back in 2004. The idea of getting 1GB of storage space completely free of charge seemed wild — and all of your messages could be got at in a simple web browser tab.
As someone who had become accustomed to deleting emails to save space, and painstakingly moving over message archives manually every time I got a computer upgrade, this sounded fantastic. So did being able to get at my emails from any device I wanted, instantly (that seems less appealing these days, somehow).