Yahoo recently announced they're doing away with e-mail storage limits in May. I've had a Yahoo e-mail account for many years now but I more or less switched to Gmail when they offered more storage capacity for free. My Yahoo account still exists, of course, but it's mostly filled with old stuff and incoming spam.
Over the last couple of days I've come to regret that move to Gmail as Google's service has been up and down since Tuesday morning. It seems relatively stable right now but it was still choking when I initially logged in earlier today.
Maybe I'm in the minority on this, but increased storage space is no longer a compelling reason for me to switch services. Heck, I'm only using 7% and 11% of Gmail's and Yahoo's space today, so why do I need a lot more?
Btw, if you're one of those people who use these services as a free backup utility, uploading all your photos and documents and feeling safe and secure, think twice! I've had a few messages disappear from both services over the years and would never consider either to be a viable primary backup strategy.