Last weekend Gmail increased the size of allowable attachments from 20 MG to 25 MG. One has to wonder if this was done mainly to garner more people to sign up for Google email service since they suggest changing from any service that will not accept attachments of that size.
"With Gmail, you can send and receive messages up to 25 megabytes (MB) in size.
Please note that you may not be able to send larger attachments to contacts who use other email services with smaller attachment limits. If your attachment bounces, you should invite them to Gmail," the mail FAQ recommends.
Gmail is a dsitant third to Yhaoo Mail and Microsoft Mail/Hotmail, but by offering bigger attachments they can entice people to change. Given they monetize their email through ads inside the interface and that Google wants to monopolize as many aspects of the web this current move is a clever one.