Folks,

My Blackberry Curve 8310 has about 58M memory. Now the free space is down to 2M.

I installed a 4G MicroSDHC card.

How can I save my email messages (or other such as from Yahoo Messanger) into the Media Card?

Thanks all in advance

Sorry, but you can't.
It is not possible to store messages (or IM conversations) on the media card.

So how can I improve the memory size. I just have the Blackberry within a week. No photos, files....

Raptors - I have a 2GB SD card installed. I have OS4.5 and am copying, via file manager, files I want to have quick access to on my BB. I've read that with OS4.5 you can run a DocstoGo viewer and view MS office files from the card. I"m working that right now.
In short. Copy your files to your SD card using your computer. Unfortuantely, you'll have to delete them out of email to make room on your built in memory.