Sun also bought Cobalt Networks (for $2 billion), the company behind the Cobalt Qube, soon after their successful IPO. The Qube was a cool Unix server appliance, targeted at ISPs, etc. [1] I worked for a short while at a startup that used one of them.
https://en.wikipedia.org/wiki/Cobalt_Qube
https://en.wikipedia.org/wiki/Cobalt_Networks
[1] Sun's buy of Cobalt had bad timing, since the dot-com bust happened soon after.
