I don't always need to open every email that hit's my BB so I often use the "mark all read" command on my previous BB's. For the life of me I can't see how to do that on the Z10. Could anyone enlighten me?

I also did not found this. You can mark muliple messages, and, mark them as read or unread, but, I found no function to set all mails from the current as read/unread.

I dont believe mark all is available

Probably - if you do a filtered search and have what you want in one window. It's a PITA, but I think it works.

If you long press on one of the date headers there is an option on the context menu to mark prior read.