Outlook also downloads and stores the emails locally, if the emails isn&#x27;t in the PST the search takes ages and if you don&#x27;t use recent versions of Exchange with all their bells and whistles and full indexing then finding anything is near impossible (e.g. searching within attachments).<p>No one will use Gmail if they need to download GB&#x27;s of Junk they haven&#x27;t cleared in 10 years to find an email for 2 months ago, not to mention that any type of sharing will force major duplication as well as require you to download and generate new copies with each person you want to share it with.