Citrix Systems

The Citrix Systems, Inc. is a US-based software company, which was founded in 1989 by Ed Iacobucci and today is headquartered in Fort Lauderdale, Florida. Citrix is traded on the NASDAQ under the symbol CTXS. Citrix Systems is active in 35 countries. The company is a member of the Linux Foundation.

The headquarters of the region "Central Europe " is located in Hallbergmoos near Munich. The Citrix Systems International GmbH has its headquarters in Schaffhausen in Switzerland.

According to information provided 230,000 organizations worldwide rely on Citrix one, including 99 percent of the Fortune Global 500 corporations. Since the acquisition of XenSource, Inc. in October 2007, Citrix Systems is responsible for the Xen open source hypervisor project.


Citrix was founded in 1989 by former IBM developer Ed Iacobucci in Richardson (Texas, USA) with an initial capital of 3 million U.S. dollars. Shortly thereafter, the company moved to Coral Springs (Florida, USA).

The original company name was citrus. After another company claimed trademark claims, one designated by Citrix. It is a portmanteau of Citrus and UNIX.

Many of the original founding members were already active in IBM-OS/2-Projekt. The vision Iacobuccis was to develop an OS / 2 with multi -user support. After IBM showed no interest in this idea to Iacobucci decided to leave the company. He then received a job offer as Chief Technical Officer at Microsoft, preferring, however, to start his own business.

The first product, Citrix MULTI USER, based on OS / 2 Citrix licensed the OS/2-Quellcode Microsoft and so bypassing IBM. Market shares of UNIX was hoped to secure by the use of simplified text-based OS/2-Anwendungen. However, the product found few takers because Microsoft announced in 1991, / not to support OS 2 on.

In 1990, took over Roger Roberts, who was formerly employed by Texas Instruments, the new CEO of the company. Three years later, Citrix purchased the product Netware Access Server from Novell. It was a DOS-based and Quarterdeck Expanded Memory Manager Remote Access application. It offered - as today's terminal server - already provide the possibility of desktops and applications from a server to multiple users. Citrix developed this product continuously and published it under the name WinView. As such, it became one of the first commercially successful Citrix products.

In December 1995, Citrix went public.

Relationship with Microsoft

Today's close cooperation between Citrix and Microsoft is the result of over 20 years of collaboration. It began in 1989 with the licensing of the OS/2-Quellcodes by Citrix.

In 1995, Citrix WinFrame with a Windows NT multi-user version with Remote Access. It was at that time the first product of its kind and was specifically aimed at the needs of large enterprises. During the development of WinFrame for Windows NT 4, Microsoft decided to license the source code to Citrix. In addition, Microsoft threatened with its own version of WinFrame. Then Microsoft and Citrix entered into negotiations to resolve this situation. It came here to an agreement which had the licensing of Citrix technology by Microsoft for Windows NT Server 4.0 and finally the Windows Terminal Server Edition consequence.

In return, Citrix agreed to bring no competitive product on the market. However, the company retained the right extensions to Microsoft products to sell. This was done initially under the name MetaFrame. This partnership continued until the era of Windows 2000 Server and Windows Server 2003 with Metaframe XP and Presentation Server continues. On 11 February 2008, Citrix changed then the name of the Presentation Server product line to XenApp name used today.

The key technology, the ICA protocol, but Microsoft did not buy. Instead, Microsoft developed the Remote Desktop Protocol used in NetMeeting (RDP ) as an extension of the Protocol T.Share on. It originally came from a deal with PictureTel (now Polycom ).

In January 2008, Citrix and Microsoft announced their expanded collaboration. This alliance comprehensive virtualization solutions can now be offered. In the area of ​​desktop and server virtualization, companies want to ensure a better compatibility of both technologies.

A year later, in February 2009, the cooperation by the " Project Encore " was again a bit tighter. This announcement was accompanied by the introduction of Citrix Essentials. This 2008 Hyper- V complex configurations of Microsoft Windows servers were now possible. In addition, joint activities were decided in the areas of marketing, training and channel sales.

A further step in the cooperation with the " desktop computing" then in July of the same year by further agreements in the desktop virtualization field. These included, among others, improved integration of both technologies. So IT managers have now distributed and centrally hosted applications using Citrix XenApp and Microsoft System Center Configuration Manage managers alike. Also XenApp has been extended to include support for Microsoft Application Virtualization (App- V). Thus, the so-called "self -delivery " are performed by applications on any device on the Citrix Receiver and Citrix Dazzle run.


Became known Citrix primarily with application and terminal server applications. This has the consequence that now often the name of the company " Citrix " is used as a synonym for such an application. In recent years, however, Citrix has its product portfolio through a Virtual Desktop Infrastructure ( XenDesktop ), SSL VPN solutions ( Access Gateway ) solutions for WAN optimization ( Branch Repeater ) solutions for web application acceleration or to Web application firewalls ( NetScaler ), monitoring ( EdgeSight ) and Single Sign-On ( Password Manager ) and other security solutions expanded.

Today Citrix stands for Application Delivery Solutions ( Application Deployment ).


Since October 2007, the Citrix product portfolio also includes the Xen virtualization technology. This allows for completely homogeneous infrastructures. From the bare- metal virtualization platform in data centers across platforms for application deployment (Windows / Web / OS via ICA protocol ), via the application or OS streaming over any type of connection to any place to appliances for security and WAN optimization can deliver Citrix products which optimally but can be used due to its modular design, together or separately.

Since April 2009, Citrix provides a slightly limited free version of XenServer available.


The long -known product from Citrix is now sold under the name XenApp (formerly Citrix Presentation Server, Citrix Metaframe before ). It offers the possibility of a computer / device with a supported operating system from anywhere access via a terminal application on the corporate network without the actual enterprise software must be installed on the computer being used; there is a Citrix ICA client is required only. This client software is also available for older versions of Windows and other operating systems, so that from these dating programs are used that can not run on the actual device such as lack of hardware resources, either because the application only for specific operating systems (or versions of it) can be obtained. Often, for this purpose, low-power devices, so-called thin clients, uses and are designed solely as a XenApp client and run any application software itself.

2013, the functionality of XenApp in its sister product, XenDesktop 7 was integrated.


When XenDesktop is a VDI software for publishing applications and complete desktops on different operating systems. Using a software client, the Citrix Receiver ( available for various mobile and desktop operating systems ), the published content shown. The current version 7 was released in June 2013.


When Citrix Receiver is a client to use Citrix server -provided services. The software can be used on virtually all popular devices (PC, Mac, iPhone, iPad, etc.) to take advantage of deployed applications and entire desktops "on demand". Here, nature and location of the terminal do not matter, which minimizes the administrative burden normally.

Overview of current products and online services

( not listed in products editions)

Training program

Citrix operates its own training program, in which case examinations must be taken in order to document a particular level of education.

The earlier statements of this program, the certificates as mentioned, were Citrix Certified Administrator (CCA ), Citrix Certified Advanced Administrator ( CCAA ), Citrix Certified Enterprise Administrator ( CCEA ), Citrix Certified Enterprise Engineer (CCEE ) Citrix Certified Integration Architect (CCIA ) Citrix Certified Sales Professional ( CCSP ) and Citrix Certified Instructor (CCI ).

Since the summer of 2013, the Citrix certifications are specialized in oriented in the fields of apps and desktops, Networking and Mobility and the gradations Associate, Professional and Expert store.

Mobility certifications will be available from spring 2014.