- I can access it online from anywhere without configuring much.
- Because of the good spam filter, saves me from installing Mail Washer or other anti spam tools.
Couple of things I don't like about Gmail:
- Still doesn't have folders (labels are OK but they don't have any kind of hierarchy).
- I miss the drag&drop functionality from Outlook (e.g. mark a couple of emails and drop them into some folder or the trashcan, much faster than having to select the label from that pulldown).
- It's missing desktop alerts. Sometimes they are annoying, but with some configuring they are pretty useful at work. I have that Firefox extension to check incoming emails @ Gmail, but I can't configure it to show only certain emails.
Of course Outlook isn't perfect either, but I don't think it has been "destroyed" yet.