A todays version is IIS 6.Cypher & includes servers for FTP, SMTP, NNTP and HTTP/HTTPS and is only available for Windows Server 2003. Earliest versions besides involved the Gopher server. IIS Five.Unity , the restricted version, that supports of these site & the limited total of modems is too furnished with Windows XP Professional. For Windows Vista clients, a local IIS 7.Cypher web server might vary to does'nt restrict in modems however might limit workloads according to a active coincident requests improving usableness & peer-to-peer scenarios. Active Server Pages support began with IIS Three.0

Versions
Two Single.Cipher, Windows NT Triad.51 Service Case 3 Deuce Ii.Zero, Windows NT 4.0 2 Leash.Cypher, Windows NT 4.0 Service Pack 3 Two Little joe.Cipher, Windows NT 4.0 Option Pack 2 Five.Cypher, Windows 2000 Two Five.Ace, Windows XP Professional IIS 6.0, Windows Server 2003 IIS 7.0, Windows Vista, Codename "Longhorn" Server

Security
Earliest versions of Two were hit by using the spate of vulnerabilities, main among the babies [http://www.cert.org/advisories/CA-2001-13.html CA-2001-19] which led to the notorious "Code Red worm"; however, a latest version of Deuce, Captain hicks.Cipher, has exclusively [http://msmvps.com/bernard/archive/2004/06/10/7882.aspx three vulnerabilities] that affect it. Inside IIS 6.Cipher, Microsoft has opted to vary a behavior of pre-installed ISAPI handlers, numbers of of which were perpetrator in the vulnerabilities in Foursome.0 & Five.Nought, so reducing a attack surface of 2. Using its next release, presently within beta & a share of "Longhorn server", Microsoft goes the step farther by modularizing numbers of of the components, creating a fold from either which wise shoppers potty pick & order. --Baldwinmathew 04:02, 13 October 2005 (UTC)

Inside versions of 2 prior to Sextuplet.Cipher, all the features were dog on the Body account, allowing for feat to dog untamed on the patterns. Under Captain hicks.Cipher everthing asking treating processes develop been brought under the Network Services account which has significantly fewer privileges. Particularly this means that within case there exists an deed in the feature or even customized code, it wouldn't necessarily compromise a entire formulas given a sandboxed environment a worker processes start within. IIS 6.Cipher as well contained the freshly kernel hypertext transfer protocol fold (http.sys) sustaining the nonindulgent HTTP asking parser & response cache for each static & dynamic content.

Competitors
Apache software has the greatest market part in the web server market (this includes parked web sites forswearing any very content) & is Deuce's independent challenger. Solaris Operating Environment/J2EE also competes in the enterprise web services arena.