I like how it can sync to my phone or tablet so that i'm always up date no matter where im at! It's super simple which makes me feel more comfortable using this software over other programs out there for work use only (i have used outlook before).
The fact you cant add multiple addresses in one message box would be an improvement as well but overall not many issues here just make sure u get familiarized first because its pretty straightforward once your got everything set right away!! Highly recommended if ur looking into something similar/easy accessable from anywhere without having constant internet connection available all day long.