Not the same a full screen but...........
Double click on the email in the upper window area. This will open a new
Window. Resize this to be what you want. Then go to File | Exit.
Now, double click on the email again. The Window that opens will be the
same as when you exited previously.
No, you can't save the "maximized" state size. Only a resized Window size.
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Regards,
Richard Urban
Microsoft MVP Windows Shell/User
(For email, remove the obvious from my address)