XP at WorkShare is described in glowing terms in several papers [on the ObjectMentor site?]. Then, 

http://www.objectmentor.com/ourCustomers/index

''Oh go on, you're such a tease! While I'm here though: had you considered a WikiName starting with Xp, for the benefit of those using LikePages?''

If it is going so good, why is the company going bust then?

You might find that the dead links are to do with Workshare revamping their site.