The HTML format is not supported by all email clients. Microsoft Outlook 2007 supports both plain text messages and HTML emails that contain links, formatting and graphics.

Marketers who e-mail newsletters to support branding and direct response goals appreciate how HTML formatting lets them insert images such as their company logo and product pictures.

Message Formatting in Thunderbird. With a dash of creativity and Mozilla's Thunderbird desktop email program, you can compose professional looking business emails that should impress your recipients.

Combine the features and formatting of HTML e-mail with the safety of plain-text messages by designating specific senders as safe.