Windows Live OneCare (formerly Windows OneCare Live , codenamed A1 ) was a computer security and performance enhancement service developed by Microsoft for Windows . A core technology of OneCare was the multi-platform RAV (Reliable Anti-virus),  which Microsoft purchased from GeCAD Software Srl in 2003,  purpose discontinued.  The software was available as an annual paid subscription, which could be used on up to three computers.
On November 18, 2008, Microsoft announced that Windows Live OneCare would be discontinued on June 30, 2009 and will be offering users a new free anti-malware suite called Microsoft Security Essentials to be available before then. However, virus definitions and support for OneCare would continue until a subscription expires.  In the end-of-life announcement, Microsoft noted that Windows Live OneCare would not be upgraded to work with Windows 7 and would also work in Windows XP Mode . 
Windows Live OneCare entered a beta state in the summer of 2005. The managed beta program was launched before the public beta, and was located on BetaPlace, Microsoft’s train beta delivery system. On May 31, 2006, Windows Live OneCare made its official debut in retail stores in the United States . 
The beta version of Windows Live OneCare 1.5 was released in early October 2006 by Microsoft. Version 1.5 was released on January 3, 2007 and was made available to the public on January 30, 2007. On July 4, 2007, beta testing started for version 2.0, and the final version was released on November 16, 2007.
Microsoft acquired Komoku on March 20, 2008 and merged its computer security software into Windows Live OneCare. 
Windows Live OneCare 2.5 (build 2.5.2900.28) Final was released on July 3, 2008. On the same day, Microsoft also released Windows Live OneCare for Server 2.5.
Windows Live OneCare features integrated anti-virus , personal firewall , and backup utilities , and a tune-up utility with the integrated functionality of Windows Defender for malware protection. A future addition of a registry cleaner has been considered  .  Version 2 added features such as multi-PC and home network management, printer sharing support, start-time optimizer, proactive fixes and recommendations, monthly reports, centralized backup, and online photo backup. 
Windows Live OneCare is built for ease-of-use and is designed for home users. OneCare also attempts a very simple interface to lessen user confusion and resource use. [ citation needed ] It adds an icon to the notification area that tells the user a glance the status of the system using green colors: green (good), yellow (fair), and red (at risk). 
Version 1.5 of OneCare is only compatible with the 32 bit versions of Windows XP and Windows Vista.  Version 2 of OneCare supports 64 bit compatibility to Vista. In version 2.5, Microsoft released Windows Live OneCare for Server which supports Windows Server 2008 Standard 64-bit and Windows Small Business Server 2008 Standard and Premium editions. No edition of OneCare operates in safe mode. Windows Live OneCare will not support Windows 7 and has been discontinued and replaced by Microsoft Security Essentials .
Windows Live OneCare requires users to activate the product if they wish to continue using Windows Live ID (90 days) . When the product is activated, the gray message bar at the top of the program disappears. The subscription remains active for 1 year from the date of activation. Windows Live OneCare does not require the operating system to be checked with Windows Genuine Advantage .
Windows Live OneCare Protection Plus is the security component in the OneCare suite. It consists of three parts:
- A personal firewall capable of monitoring and blocking both incoming and outgoing traffic (The built-in Windows Firewall in Windows XP only)
- An anti-virus tool that has been updated regularly anti-virus definition files to protect against malicious software
- Anti-spyware tool That uses the Year Windows Defender engine as a core to protect contre Potentially unwanted software (In version 1.0, this required the separate install of Windows Defender and Was not integrated into the OneCare interface although It Could Be managed and lancé from OneCare Version 1.5 The Windows Defender Engine Into OneCare and no longer requires separate installation.)
Windows Live OneCare 1.5 also supports Internet Explorer 7 and 8 security settings and ensures that the automatic website checking feature of the Phishing Filter is enabled.
- Disk cleanup and defragmentation.
- A full virus scan using the anti-virus component in the suite.
- User notification if files are in need of backing up.
- Check for Windows updates by using the Microsoft Update service.
Windows Live OneCare Backup and Restore is the component that helps you back up up important files. Files can be backed up to various recordable media, such as external hard disks, CDs, and DVDs. When restoring files, the whole world can be restored to a networked computer, as long as it’s running OneCare as well. The Backup and Restore component supports backup software features such as incremental backups and scheduling.
Windows Live OneCare has been criticized by both users and competing security software companies.
Microsoft’s acquisition of GeCAD RAV, a core technology of OneCare, and their subsequent discontinuation of that product, the GNU / Linux platform (and others) of one of the leading scanning tools for e-mail servers, bringing Microsoft’s ultimate intentions into question . 
On 26 January 2006, Windows Live OneCare Was Criticized by Foundstone (a division of the competing McAfee antivirus) for the integrated firewall HAVING default white lists qui allow Javaapplications and digitally signed software to bypass user warnings, since Neither Of Those applications carry assurances that they will not have security.  Microsoft has had a reaction to the problem, which is why they are widely used by third party applications , and that it is highly signed. ” 
Windows Live OneCare has also been criticized for the lack of adherence to industry firewall standards regarding intrusion detection. Tests conducted by Agnitum (the developers of the Outpost Firewall) have shown OneCare failing to detect trojans and malware which hijacked applications already resident on an infected machine. 
In February 2007, the first Windows Vista anti-virus product testing by VirusSmart magazine (a sister company of Sophos , the developers of Sophos Anti-Virus) found that Windows Live OneCare failed to detect 18.6% of viruses. Fifteen anti-virus products have been tested.   To pass the Virus Bulletin’s VB100 test, an anti-virus product has to detect 100% of the viruses.
AV-Comparatives also released results that Windows Live OneCare last in its testing of seventeen anti-virus products.   In response, Jimmy Kuo of the Microsoft Security Research and Response (MSRR) team pledged to add “truly important” (“actively being spread”) malware as soon as possible, while “[test detection] numbers will get better and better “for other malware” until they are on by the other majors in this arena. ” He also expressed confidence in these improvements: “Soon after, [other majors] will need to catch up to us!” 
As of April 2008, Windows Live OneCare has passed the VB100 test under Windows Vista SP1 Business Edition.  As of August 2008, Windows Live OneCare placed 14th out of 16 anti-virus products in on-demand virus detection rates. On the other hand, as of May 2009, Windows Live OneCare placed 2nd in a proactive / retrospective performance test conducted by AV-Comparatives.  AV-Comparatives.org, the test issuer, denotes that it had “very few false alarms, which is a very good achievement.” The publisher also points out that false positives can cause as much harm as true infections, and furthermore, anti-virus scanners prone to false alarms generally achieve higher detection scores. 
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