Hope this helps someone, I was going nuts without my shortcuts in Messages.
Now there are multiple ways to move top/bottom and I think one of them is going to be previous day and next day and not really Top and Bottom.
I'll have to wait until after midnight to find out which one is which!
2 is up,
8 is down,
5 is select/open.
1 takes you to the top. (Was: T on old bberry)
7 takes you to the bottom. (Was: B on old bberry)
9 is down one page.
3 is up one page.
6 is the top and 4 is the bottom too. Hrm. This one is probably "previous day / next day" but not sure yet.
L/, to compose new email
A/S to reply-ALL (answer?)
Q/W to reply to sender (write?)
./O/P to forward message