Thanks to a partnership between Microsoft, Nokia, and Citrix, a Citrix Receiver app is now available for Windows Phone 8. The apps allows you to connect to the various desktop vitalization services offered by Citrix (e.g. XenDesktop, XenApp), allowing you to "tune into project dashboards, check email, review documents and approve expenses on the go".

Following on from apps like Good and RSA, the arrival of the Citrix Receiver app helps further burnish the Windows Phone platform's credential as an enterprise ready product and its arrival is a reflection of the maturing app situation on Windows Phone. The intial release of the app covers the bases, but there's room for improvement with the lack of landscape mode and relatively sluggish performance being the most obvious areas that need addressing.

From the Citrix blog:

It works just like other Windows Phone 8 apps and other Receivers. When used with the Citrix Mobility Pack, Receiver automatically displays the device keyboard when an editable field has the focus. And, the desktop session scrolls if needed to make the input area visible.

It works with Citrix XenApp 5 and up, XenDesktop 5.6 and 7, VDI-in-a-Box 5.3, StoreFront 1.2 and 2.0, Web Interface 5.4, Access Gateway 9.3 and 10, as well as Netscaler Gateway 10.1. 

Windows Phone Store description:

Citrix Receiver lets you access your enterprise files, applications, and desktops to help you be as productive on the go as you are in the office. If your company uses Citrix, you have the freedom to work on your Windows Phone from wherever you are. 

Citrix Receiver is a free download from the Windows Phone Store. In order to use the app it will need to be configured for your organisation service.