I just upgraded my OS to "Lion" and would like to make the Mail icons/lettering smaller. Can anyone tell me how to do that?

Howdy jandbfy,

Welcome to Apple Support Communities.

It sounds like you’re interested in changing the icon size in Mail for Mac OS X Lion. The article linked below provides information about customizing the sidebar in Mail and will walk you through the process of changing the icon size.

Lion Mail: Show or hide the sidebar

To adjust the size of the icons in the sidebar, choose Apple menu > System Preferences, click General, and then select a sidebar icon size.

Also, you may be intersted in this article which provides details about customizing the toolbar in Mail.

Lion Mail: Customize Mail toolbars

Ciao,

-Jason

No problem.