Internet web pages are usually designed to conform to internationally accepted standards set by the World Wide Web Consortium (W3C). As long as the web page you are viewing is standards compliant and you use a browser that is also standards compliant, then the page will render the way it is supposed to.
These days all operating systems come with web browsers installed, but some are better than others.
Linux and BSD-based operating systems often come with Firefox or Chromium, which are excellent browsers and both standards compliant. Android based systems, which are also Linux, often come with Google Chrome, which is also a very good and standards compliant browser.
Apple products, including iPads and iPhones, usually come with Safari, which is a good standards compliant browser as well.
You can note that the Zimbra web mail interface looks the same in the three standards compliant browsers illustrated on the right, which is the way it should work!
Microsoft Windows systems come with Internet Explorer (IE), which is a browser that has a long history of issues and has generally not been standards compliant. Modern versions of IE, like IE9, IE10 and IE11 are supposed to be standards compliant, but testing shows that they do not render standards compliant web pages, like NCF's Zimbra web mail pages, properly, which can cause problems. As a result Internet Explorer is not recommended.
In extensive testing of IE10 with Zimbra 7 in May 2013 NCF's system administrator reported:
IE10... behaviour is inconsistent.
The first time I opened up Zimbra, it loaded up totally fine. Granted I did get a mystery error pop-up about a zimlet that couldn't load, but that's survivable.
Afterwards, it was giving me trouble, and I couldn't get it to load at all, and then it loaded with text-only (basically gibberish), and then I got it to load again.
The compose/reply buttons don't work. Unlike some of those that have complained, I'm more insistent on things working, so I tried a bit harder!I found if I double-click on a message to load it in a separate menu, then I can get the reply to work...There's no telling with this thing, clearly IE10 can't be safely used with Zimbra right now.
NCF members have reported problems with IE11 as well, not rendering page menus correctly and other similar issues.
February 2014 compromise of Internet Explorer 10 and earlier
On 14 February 2014 Carnegie Mellon University in conjunction with the US Department of Homeland Security published a report that showed that IE10 and earlier versions had been compromised by a flaw in the browser design in combination with the Adobe Flash Player. Just viewing a website allows the browser to execute arbitrary code allowing the attacker to gain control of your computer. The report included the fact that the exploit code was publicly available and that it was being actively taken advantage of through a large number of attack websites.
Because these are older, unsupported versions, they will not have patches issued and thus can no longer be used. If you are using IE10 or earlier either upgrade to IE11 immediately or switch to using a different browser to protect your computer from being compromised.
Note that Windows XP users cannot install a newer version of Internet Explorer than IE8 and so must switch to an alternate browser.
April 2014 compromise of all versions of Internet Explorer
In April 2014 the US Department of Homeland Security advised people to not use Internet Explorer, due to a security flaw that compromised all versions of the browser:
- Internet Explorer bug used by hackers to attack U.S. firms - Malicious Operation Clandestine Fox campaign targets U.S. defence, financial firms - CBC
Internet standards change over time and browsers are updated regularly. Using older, outdated versions of web browsers is not recommended for several reasons:
- newer versions usually have fixed identified security issues, meaning that by using older browser versions you could compromise your computer
- newer browser versions incorporate newer features that show modern web pages properly. For instance older browsers will not support modern HTML5 or Ajax, which makes modern interactive sites, like Zimbra work.
Use the most up to date version of your favourite browser, that way web pages will work right and you will be more confident that old security vulnerabilities have been addressed.
Getting a new browser
Rather than use IE, NCF recommends that you use other alternate, standards compliant browsers, all of which are available for free, such as:
- Apple Safari for Mac OSX
- Gnome Web (formerly called "Epiphany") for Linux
- Google Chrome for BSD, Linux, Mac OSX, and Windows
- Midori for BSD, Linux and Windows
- Mozilla Firefox for BSD, Linux, Mac OSX, and Windows
- Mozilla SeaMonkey for BSD, Linux, Mac OSX, and Windows
- Opera for BSD, Linux, Mac OSX, and Windows
- SRWare Iron for BSD, Linux, Mac OSX, and Windows