Get out your workstation and application use inventories.¹

Make a list of all applications used and check whether they are supported by either LTSP or Windows application servers.²

If you are thinking of switching to Linux, you should know that Linux has environments for running Windows only applications like Photoshop.  These are a little time consuming to get going, but once done work very well.  You should google things like "Linux Photoshop" and see if there are reported problems.

 Now, here's the important bit.  Unless you have extremely good management you will not get permission to make sweeping changes without extensive trials.  You probably cannot even get a budget for a Windows application server license.  All is not lost.

No management support Method 

1. Take an old 2 gHz workstation and be sure it has two RJ-45 ports. 
   
   
2. Install K12LTSP on it.  You now have a running Application Server.
   
   
3. Take an even older 800 mHz or so computer for a client. 
   
   
4. Google on PXES.  This will take you to a place to download a Bootable CD for making a PC into a Thin Client.
   
   
5. Connect the LAN from the client to the server on the second network card on the server.  The first is for accssing the internet.
   
   
6. Burn the CD then boot it.
    

Amazingly, some  Cape Cod organizations do not have either.  Should library patrons or school children be on computers for which no one has a good idea of what they are running?  How many town computers 'disappear' every year?

² Applications should be considered by their purpose not their name.  For example Internet Explorer is an application program with browsing as the purpose or application.  Many people consider changing to FireFox an upgrade, as it is faster and easier to use for browsing. 

If you do this you may discover some ancillary benefits of improved application programs over what you are using.