Yahoo vs Google vs Outlook
If people are concerned about privacy then zip your files with a password, then google etc. can see your information. But if companies still want to be in the stone ages with Outlook and have IT guy's fixing it constantly, not to mention viruses that love Outlook'
And you can always download your contacts from the popular email programs to have a backup'. And how many times has Yahoo and/or Gmail gone down in the last 2 years?