I am running Outlook for Mac 2011. When I create a numbered list, the first level shows up as a number (e.g. 1) and then I hit TAB to get the sub-level and expect it to show up as a letter (e.g. a). But the second level also shows up as a number (e.g. 1). So, my list looks like 1>1 instead of 1>a. 

How can I fix this? 

Note: I do not have this problem with Word for Mac. Just Outlook for Mac. 

Thanks.