Let us say you have a requirement where you want to add an email address in word document and clicking the link will launch compose email message prepopulated with recipient address and Subject. You can do this in Word 2016 and Word 2013 using the option available as part of Hyperlink feature.
Step 1: Launch the word document where you want to insert the email address.
Step 2: Navigate to Insert menu and click Hyperlink option available under the Links section. You can also access Hyperlink feature using right click context menu.
Step 3: Click the E-mail Address under Link to: section in Insert Hyperlink window.
Step 4: Now enter the Text to display, E-mail address and Subject for the email in the respective field. Click Ok button to insert the link in document. This would insert the email address in the document as shown below.
Clicking the link should display the following window asking for your preference.
If you have selected Outlook from the above list then Outlook message compose window will be displayed prepopulated with email address and subject.