Microsoft software tool used for developing a database. Any database vendor you work with — email broadcaster, list broker, third-party list-hygiene service, etc. — should be able to work with this format (as well as several others.)

Combining Email Marketing with Other Types of Marketing
Whether you choose to do your marketing online or offline, one thing does not change. This is the concept that no single marketing strategy will be as effective as a combination of two or more marketing strategies.