Microsoft Office XP
From BetaArchive Wiki
This version was released in May 2001.The XP name doesn‘t mean it only works with XP, it works with NT4(SP6a), 98,ME and 2000 as well.
There are 2 betas and a RC leaked.
Gallery
<gallery> DefaultToolbar-PDC03.png AdvancedToolbar-PDC03.png <gallery>