First, you will, again, need to have RDP 6.1 installed before transporting yourself to a remote system, so don't count on troubleshooting end users from PCs that aren't running Vista or XP SP3. The other, more significant, drawback is the inability to customize applications by user or group security--you either present an application through WebAccess, or you don't. This is a major distinguishing factor between Terminal Services and Citrix's Web services, and we can only surmise that leaving out customization was a strategically placed point of demarcation by Microsoft. Out of the box, Citrix XenApp provides a very simple methodology for customizing applications presented to users.
Finally, we set our sights on Terminal Services Gateway, which is essentially an SSL VPN that enables organizations to securely serve corporate applications over the public Internet. Configuration was somewhat cumbersome, and again you'll need RDP 6.1 to make Gateway work. But once the service was fully configured, we were impressed with how well it performed. There's no doubt that Citrix provides a more scalable and mature SSL service for presentation virtualization, but you'll need to shell out some extra bucks for a Citrix Access Gateway license to get that functionality. In contrast, Gateway is packaged into the core Terminal Services offering.
For small to midsize enterprises with simple presentation virtualization needs, Terminal Services will definitely fill the bill. But organizations that must scale to thousands of users will need the compression, acceleration, load balancing, and management options that only XenApp provides. According to Citrix, a new version of XenApp that will build on improvements within Terminal Services 2008 will be released later this year.
Next up in this Rolling Review will be Windows PowerShell. Also on tap: Server Core, Network Access Protection, Windows Virtualization Server, and more.
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