Although Microsoft’s Skype app was never intended to run on lower end Windows Phone devices as the app was only supposed to work on Windows Phone handsets with more than 512MB of RAM, Nokia announced a while back that they were testing the Skype app on the Nokia Lumia 610.
It looks like Nokia has decided to end support for the Skype app on the Nokia Lumia 610, you can see Nokia’s explanation for why this has been done below.
“Nokia values the user experience provided by its products and services. Therefore, although the Skype Windows Phone version is workable on Nokia Lumia 610, after in-depth testing, we found that the user experience is not up to par with Nokia and Skype’s expectation and decided not recommending users using Skype on Nokia Lumia 610. In the future, users of Nokia Lumia 610 would no longer be able to download Skype Windows Phone version from Window Phone Marketplace. However, Skype Windows Phone version would still be available for other users.”
So it looks like Nokia will be removing the ability to download the Skype for Windows Phone app for the Nokia Lumia 610.
Source GSM Arena