October 1994–February 1995
First logo was simply black text in Times New Roman font. It was later changed.
March 1995–2009; 1997–present (East Asia)
The font was changed a lot to a Yahoo font. It was later recolored to purple.
This logo first appeared on the headquarters and on Yahoo! Messenger, but it wouldn't come into full effect in 2009 when the site received a revamp. The slogan used at that time was "It's Y!ou". It is still used on some portals. As of 2013, this is new being used as a secondary logo.
From August 7 to September 4, Yahoo! was cycling through 30 different logos, with the finalized logo expected to launch on September 5.
In 2013, Yahoo! premiered an entirely new logo. This was a finalized logo after 30 days of changing its logo.