IMHO I think the most "professional" looking of the bunch would be the outlook.com one, simply because it is closely associated with Microsoft and Outlook, which are widely used in business. Gmail and Outlook are both widely used by all sorts of professional people. The other day I saw that some of the lawyers were using Gmail addresses in their Federal court filings. I've seen CEOs of companies use their Gmail addresses. While working for an email service provider we would often revert to using our own or client Gmail addresses when something wasn't working right with the domain email, which happens frequently. A lot of companies have lousy email systems!
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