Overall a Linux based platform can perform most of the tasks equally as well as a proprietary platform using OSS such as the excellent comprehensive Office Suite LibreOffice
http://tldp.org/LDP/intro-linux/html/chap_01.html
http://www.libreoffice.org/features/
There is really no reason to use a proprietary platform these days with the exception of High End gaming which will always be the achilles heel of Linux. Otherwise Windows is all but reduntant which is becoming increasingly evident particularly where users upgrading from XP are switching to Linux permanently
http://www.pcworld.com/businesscenter/article/247577/desktop_linux_gains_share_in_recent_months.html
The Linux Desktop is currently a mess with a plethora of options available. Unity as on Ubuntu 11.10 and GNOME 3 as on Fedora 16 are cluttered and in my opinion not suitable for use on a production machine. I need a Desktop Environment that has stability and allows me to just get things done with minimal fuss. This is where the older Gnome 2 Desktop Environment excels.
Linux Mint 12 goes some way to addressing this wth MGSE (Mint Gnome Shell Extensions) which is a layer built on top of GNOME 3 however like other distros. such as Fedora to deploy the GNOME 3 Desktop Environment for me does not convince
Linux Desktop Faceoff GNOME 3 vs Ubuntu Unity
http://lifehacker.com/5853099/linux-desktop-faceoff-gnome-3-vs-ubuntu-unity
There is a promising project being developed by Linux Mint called Cinnamon which is also a layer built upon GNOME 3 and will replace MGSE on Linux Mint 13 LTS
http://cinnamon.linuxmint.com/
I thoroughly recommend the earlier release Linux Mint 11 which is based upon Ubuntu 11.04 Its easy to install and easy to use plus it comes with much of the software you are likely to need preinstalled
Linux Mint 11 Download
http://www.linuxmint.com/edition.php?id=81
Linux Mint 11 Release Notes/Installation Guide/User Guide
http://linuxmint.com/rel_katya.php
You download the ISO. image of Linux Mint 11 then you need to create a Bootable LiveDVD
https://help.ubuntu.com/community/BurningIsoHowto
Linux Mint 11 can also be run straight from the LiveDVD without touching your Hard Drive
LUg.