Of course, it could be that these paid users partially subsidize other features (previously out of reach) for the "free tier" users, but the pricing is really high and will be immediately be out of consideration for almost all users.
I wonder how many new users would sign up for this (as opposed to those already on Mail Plus and grandfathered at $19.99).
And Yahoo still doesn't have IMAP access (while Gmail has had it for free).
> Mac OS X users can directly set up an IMAP account in Apple Mail 4.4. After entering a full name, email address, and password, hold down the Option key. The Create button will change to Continue, allowing one to manually configure the account settings.
> Apple Mail 5.0 included with Mac OS X Lion supports easy and direct IMAP account setup.
I have no affiliation with them whatsoever other than the fact I use the service.