Use Case: Single Log In

In each big company there is a big number of corporate systems.
It could be CRM system, ERP system, corporate web site, employees directory and many more ...
You have 5+ different logins with different passwords that you should remember.
Session expiration time is 20 minutes for security reasons.

Solution
You may have a browser extension (toolbar), connected to all your systems.
It will work in your favourite browser and will securely store all your passwords to corporate resources.
It will store all links to all resources as well - all you need to do is select a system by choosing a menu item or clicking a button on a toolbar.

Cost
How much time will it take to integrate corporate systems? Several years, and in usual case it is impossible at all.
How much time will it take to integrate your systems through a toolbar? Indeed, several weeks.