Vista is the newest operating system released by Microsoft, but older operating systems such as Windows XP are still very popular. It seems that many users refuse to switch to Vista. This includes home users and large companies alike. There are many reasons for such a decision; however, among the most popular ones is that Vista is expensive. Even though Microsoft released multiple versions of Vista in hopes of attracting a large number of customers, it has to be said that even the least expensive version of Vista is still quite expensive. Another reason of this operating system not being that popular is that to get the full value out of Vista you need a relatively new computer and a lot of RAM. Difficulty learning how to use a new operating system is also an important factor.