Yes, but the company is saying that GMail replaced Outlook. Clearly it has not - I'm sure most new GMail users are not ex-Outlook PIM users. This is because GMail is in a different product category

- what percentage of GMail users regularly schedule more than one event a week?

- what percentage of Gmail users use reminders?

- How much of their day is spent with GMail open?

- How often do they search Google contacts for phone numbers and other data?