The inbuilt search of the TO, CC, or BCC boxes does not find distribution lists, though earlier versions did.
I am aware that from the contacts list one can select Send Message from the dropdown obtained by right clicking the name of the contact/group. But this puts the group into the To box and it is not good privacy management to send a Distribution List to all on the list. So there is an additional step to move it from TO to BCC.
Not a huge issue but an annoyance that is perhaps easily adjusted.
Otherwise no probs with new version.
Cheers, Dave