It's a very important thing for us to choose the right one from Available(frequently used paid/copyrighted) softwares and open source (Free to use) softwares. Window's vista ultimate edition is now cost AROUND USD 319.95 (SOURCE: Click This Link). That is near BDT 22000. Plus office softwares , net browsers , blah ,blah ,blah . And that is total more than the hardware costs.For people like us of a Devloping countries it is mostly impossible to buy those. So people just go to the shop and buy all those just at around BDT 40-50 each ! ! ! Do you know it is strictly FORBIDDEN ? This is a crime. But we have the second way (possible the best way !) to have these kind of softwares free of cost without doing crime . And those are Open Source Softwares.These softwares are free to use and the cdes of these softwares are also open so that people can arrange these as they want. So we better use softwares Like Ubuntu(http://www.ubuntu.com)for operating system, Open office(openoffice.org)for office softwares...many more. Interesting thing is that you can get a free CD of Ubuntu(OPERATING SYSTEM) from Ubuntu.com to your home adress. And there are lots of more things that of you would never think of.

Open Office: This packege software is to meet your ofiice needs. You can make files in .doc .docx or in its own file type. There are software for Presentation, Spreadsheet, Documents and so on.

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I am very sorry for writing it in English not in Bangla.