I wonder if anyone can tell me why this occurred? There was a group of 8 of us going through process of attaching photographs to an e-mail to share. The way we did it was to select the photographs in question. Then tap on share which is in the top left-hand corner of the screen. This usually brings up a group of Apps you can share the photographs with. One of which is the Mail app. Some of us got the Mail App, when we tapped share, and others didn't we were al using iOS 6.
Thanks for your comments in advance, much appreciated!