Click Tools > Options, then double-click Environment.

Click the Reply Format tab.

Select if you want to use the GroupWise classic format, include the headers, or use the Internet standard.

If you select Internet Standard, you must specify a separator. The default separator is the greater-than sign (>).

If you select Include Headers or Internet Standard, you must select if you want to type your response at the top of the original message or at the bottom of the original message.

Click OK.