Yahoo! Plus is a combination of security features (Pop-Up Blocker, AntiVirus Software, Parental Control, Firewall Software), Yahoo! Mail Plus (2GB mailbox, Email virus scanning and cleaning, 10 sub-accounts), broadband extras (Premium video content, Commercial-free radio), and time-saving conveniences (100MB of file storage, Yahoo! by Phone, Integrated instant messenger) to enhance your Internet experience.
The premium benefits associated with your Yahoo! Plus membership will cease on after April 22, 2006…
The premium benefits associated with your Yahoo! Plus membership will cease on this date, though you will continue to be able to use your Yahoo! Plus account ID and password to log into Yahoo! and access your personal data (such as your email, photos, My Yahoo! content, etc). In essence, you will have the same services as someone who has signed up for a free Yahoo! account. If there are sub-accounts connected to your account, they will be similarly affected (i.e., treated as stand-alone, free Yahoo! accounts).
Read the Yahoo Plus help page to see how different Yahoo Plus services will be affected.