Goes to show that big corps often have no clue how to deal with their offerings.
Source: I worked on AIM for iPhone.
IMO AIM struggled because: - it was a highly tuned, specialized C backend, and it never migrated to something that could be improved easily. - backend technical challenges (as well as legal issues) made storing chat history very difficult - Hardly any info was collected about AIM screennames, so it was hard to build a social graph from it - AIM registration was the same as AOL signup, and that registration process was very cumbersome, imo. - Most AIM accounts had no email address associated with them, so it was impossible to do password resets, for all the locked up AIM screennames.
As a client developer on AIM, it was hard to make a material improvement to AIM, though we certainly did try