I don’t know about you but it seems like Citrix has been accelerating the lifecycles for their products over the past couple of years. Maybe as I get older time is just going by that much faster which makes the product lifecycles seem shorter 🙂
At any rate if you have not been paying attention in a little less than a year from now Citrix will EOL all XenApp products running on Windows Server 2003. Then 3 1/2 months later they will EOL XenApp 6.0 and below on Windows Server 2008 leaving only XenApp 6.5 on WS 2008R2. This applies to XenApp Fundamentals as well. Citrix is maintaining a nice easy to read page covering their products here http://www.citrix.com/lang/English/lp/lp_2317305.asp
If you are not up to date with your XenApp product version, then I would start the planning phase in short order and make sure you are ahead of the curve. Especially if you have not even moved up to a Windows Server 2008R2 based OS because you might have your work cut out for you depending on the applications you are running in your environment.