I dont know if this helps but if you press "Save" instead of the big "Save and Close" button you will only have one event in both outlook and tb. I tried it in both lightning/1.02b and lightning/1.04, TB 5.0 and TB 3.1.11, exchange addon lightning-exchange-provider-v0.15.jrr.xpi and 0.13.
I dont know if this helps but if you press "Save" instead of the big "Save and Close" button you will only have one event in both outlook and tb. I tried it in both lightning/1.02b and lightning/1.04, TB 5.0 and TB 3.1.11, exchange addon lightning- exchange- provider- v0.15.jrr. xpi and 0.13.