There is no alarm preview function which makes it harder for me to assess reliability/form of alarms (as a newcomer).
*** Bug 6847 has been marked as a duplicate of this bug. ***
Orage 4.7 has this. It is possible to raise alarms immediately and see how it works. (4.7 also has repeat preview, which makes it simpler to create repeating apointments.)
in 4.8.0