BBM memory??

It seems I have no option to change the bbm memory setting so that it keeps every conversation from the very beginning of it...I am only able to scroll back so far in the conversation history before it cuts off from a random point. I have looked through the options section selected from the Instant Messenger menu and no such setting seems to be in there.

The options listed are:
Vibrate when receiving a ping
Ask password question when adding contacts
allow forwarding of requests
Show converations in message list
Group messages in conversation
Sort conversations by
Press enter key to send
Allow ont eh phone presence status
Allow now playing presence status

AND that's it!!! I've been told by others that their memory setting is located in this menu. Why isnt mine/where is it???

I would also like to know this too. Its not an big issue to me, but I would still like to know.

I have an option to save history on the device or on the media card. But I am running the 5.0 BBM have you updated?

I believe my memory is 256 MB... maybe that has something to do with it...