1. First install all the packages for Wine
#sudo pacman -S wine winetricks wine_gecko wine-mono lib32-ncurses
  1. Then install ttf-ms-fonts for microsoft fonts support
#sudo pacman -S ttf-ms-fonts

OR

#yaourt -S ttf-ms-fonts --noconfirm
  1. After that, Set up Wine Architecture and Wine Prefix as win32
#WINEARCH=win32 WINEPREFIX=~/wine32 winecfg
  1. Then, install msxml3 for msoffice2007 and msxml3&msxml6 for msoffice 2010

(for msoffice 2007 )

#WINEPREFIX=~/wine32 winetricks msxml3

(for msoffice2010)

#WINEPREFIX=~/wine32 winetricks msxml6
  1. Now, install samba package for winbind package as the lib32-libwbclient(winbind) package is discontinued in arch linux
#sudo pacman -S samba
  1. Now, install the msoffice by running setup.exe file through wine.
#WINEPREFIX=~/wine32 wine /path/to/msoffice/folder/setup.exe

Example:

#WINEPREFIX=~/wine32 wine /home/anyone/msoffice2010/MS\ Office\ 2010/MS\ Office\ 2010/setup.exe

Now, MSOffice is installed on your arch linux system.