Change Email Format
Do you send e-mails to someone on a mobile device? They probably will be able to read your e-mails easier if you send them as "plain text". You can setup their e-mail account so that they always receive your e-mails as plain text, without you having to remember each time you send them an e-mail.
To do so, follow these simple steps:
Open your Contacts Folder in Outlook.
Double-click the desired contact.
Double-click the email address in the top right section of the contact. (You may have to click the drop down to select an alternate address)
From the "Internet Format" drop down, choose "Send Plain Text only".
Save and Close the Contact.
Now the recipient will always receive your e-mails as plain text.