Microsoft Internet Security and Acceleration Server (ISA Server), now change to Microsoft Forefront Threat Management Gateway (Forefront TMG). It is network security and protection solution for Microsoft Windows. ISA Server allows administrators to create policies for regulating usage based on user, group, application, destination, schedule, and content type criteria. ISA Server is designed to work with Windows Server operating systems and to take advantage of Windows' Kerberos security. ISA Server includes a software development kit (SDK).

 
Features Of latest Microsoft Forefront Threat Management Gateway
  • Routing and remote access features: Microsoft Forefront TMG can act as a router, an Internet gateway, a virtual private network (VPN) server, a network address translation (NAT) server and a proxy server.
  • Security features: Microsoft Forefront TMG is a firewall which can inspect network traffic (including web contents, secure web contents and emails) and filters out malwares, attempts to exploit security vulnerabilities and content that does not match a predefined security policy. In technical sense, Microsoft Forefront TMG offers application layer protection, state full filtering, and content filtering and anti-malware protection.
  • Network performance features: Microsoft Forefront TMG can also improve network performance: It can compress web traffic to improve communication speed. It also offers web caching: It can cache frequently-accessed web contents so that users can access them faster from the local network cache. Microsoft Forefront TMG 2010 can also cache data received through Background Intelligent Transfer Service, such as updates of software published on Microsoft Update website.
 
Feature with Edition of ISA Server 2006
Feature
Standard Edition
Enterprise Edition
Networks
Unlimited
Unlimited Adds enterprise networks
Scale up
Up to 4 CPUs, 2-gigabyte (GB) RAM
Unlimited (per operating system)
Scale out
Single server
Up to 32 nodes through Network Load Balancing
Caching
Single-server store
Unlimited (through Cache Array Routing Protocol [CARP])
Windows Network Load Balancing (NLB) Support
Not supported
Yes (integrated)
Policies
Local
Array and enterprise policies use Active Directory Application Mode (ADAM)
Branch office
Through the manual import and export of policy
Enterprise-level and array-level policies
Monitoring/alerting
Single-server monitoring console
Microsoft Operations Manager  (MOM) Management Pack
Multi server monitoring console
MOM Management Pack
Multiple networks
Templates
Templates

Edition of ISA Server

Microsoft Proxy Server
Microsoft Proxy Server v1.0 was first launched in January 1997, and was designed to run on Windows NT 4.0. Microsoft Proxy Server v1.0 was a basic product designed to provide Internet Access for clients in a LAN Environment via TCP/IP. Microsoft Proxy Server v1.0 only had basic functionality, and came in only one edition. Extended support for Microsoft Proxy Server v1.0 ended on 31 March 2002
ISA Server 2000
Microsoft launched Microsoft Internet Security and Acceleration Server 2000 (ISA Server 2000) on 18 March 2001. ISA Server 2000 introduced the Standard and Enterprise editions. ISA Server 2000 required Windows 2000 (any edition), and will also run on Windows Server 2003. ISA Server 2000 reached End of Life on the 12 April 2011.
ISA Server 2004
(ISA Server 2004) was released on the 8 September 2004. ISA Server 2004 introduced multi-networking support, integrated virtual private networking configuration, extensible user and authentication models, application layer firewall support, Active Directory integration, Secure NAT, and improved reporting and management features. The rules based configuration was also considerably simplified over ISA Server 2000 version. ISA Server 2004 Enterprise Edition included array support, integrated Network Load Balancing (NLB), and Cache Array Routing Protocol (CARP). One of the core capabilities of ISA Server 2004. Some organizations use ISA Server 2004 to publish their Microsoft Exchange Server services such as Outlook Web Access (OWA), Outlook Mobile Access (OMA) or ActiveSync. ISA Server 2004 is available in two editions, Standard and Enterprise. Enterprise Edition contains features enabling policies to be configured on an array level, rather than on individual ISA Servers, and load-balancing across multiple ISA Servers.
ISA Server 2004 runs on Windows Server 2003 Standard or Enterprise Edition.
ISA Server 2006
Microsoft Internet Security and Acceleration Server 2006 were released on 17 October 2006. It is an updated version of ISA Server 2004, and retains all features from ISA Server 2004 except Message Screener.
ISA Server Appliance Edition
Microsoft also offers ISA Server 2006 Appliance Edition, software designed to be pre-installed onto an OEM hardware that is sold by the hardware manufacturer as a stand-alone firewall type device.
Microsoft Forefront TMG MBE
Microsoft Forefront Threat Management Gateway Medium Business Edition (Forefront TMG MBE) is the next version of ISA Server which is also included with Windows Essential Business Server. This version only runs on the 64-bit edition of Windows Server 2008 and does not support Enterprise edition features such as array support or Enterprise policy.
Microsoft Forefront TMG 2010
Microsoft Forefront Threat Management Gateway 2010 (Forefront TMG 2010) was released on 17 November 2009. It is built on the foundation of ISA Server 2006 and provides enhanced web protection, native 64-bit support, and support for Windows Server 2008 and Windows Server 2008 R2, malware protection and BITS caching. Service Pack 1 for this product was released on 23 June 2010. It includes several new features to support Windows Server 2008 R2 and Microsoft SharePoint 2010 lines of products.

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