Even though new versions of Linux distributions are working fine with Malayalam; default fonts bundled with them are not supporting [http://unicode.org/versions/Unicode5.1.0/#Malayalam_Chillu_Characters Atomic Chillu Characters] defined in Unicode 5.1.0. [http://malayalam.homelinux.net/evuraan/Unicode-5_1_0/Rachana_04.ttf This Modified version of Font Rachana] renders newly defined atomic Chillaksharams. You can also use [http://malayalam.homelinux.net/evuraan/Unicode-5_1_0/ these fonts] which has Atomic chillus. If you are reluctant to use fonts which are encoded with atomic chills, use [https://addons.mozilla.org/en-US/firefox/addon/7289 this] firefox extension to convert newly defined Chillaksharams to old fashion.
==== For Windows/IE 6 users ====
The older kartika unicode font supplied with windows, does not support Unicode 5.1 Atomic Chillus. So, users of Windows XP and Internet Explorer 6 should have difficulty in viewing atomic chillus in their edit box, even after installing and configuring a newer Unicode 5.1 compatible malayalam font. '''Uninstalling Kartika.ttf font''' and '''configuring the user interface elements (such as Window title, icon etc) to use any Unicode 5.1 compatible font (such as Anjali/Rachana)''' through Display properties in control panel will fix this problem. Use Controlpanel->Display->Appearance->Advanced option for this
==For users of Mac OS X==