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I still do NOT have reply and send icons on my header bar

If you mean the unified tool bar, you set that by rightclicking and selecting 'customize' and then dragging all of your preferences there. I really like that feature in 115.

The other option is that the menu bar may be hidden. Click the 'new messages' button and on next pane, click the alt key and the menu bar should appear. click view>toolbars>composition toolbar. Let me know if that works.