When using the "To" button to send a message to some one the only way is to
know it's name but if i only know his Company or Category, yes you can find
out by using the contacts but you can't Drag & drop your contacts in the "To"
Textbox to get there default e-mail address for you. you need to type their
names
I woud also wish for the Drag & drop functionality on the Address Feilds
where i can multi select Contacts from another contact window & dorp them in
a message & they get filled in one of the Address fields where i dorped them