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You go Microsoft window and you write a letter in potraits and write a letter.
Microsoft Word
The most common is Microsoft Word
You Could write it out using pen or pencil or you could type it up using microsoft word on your computer if you have one.
You write a letter whenever you wish to correspond with someone using the postal system, as opposed to using email over the internet.
If you mean can you write something using Microsoft Works word-processor - and open it using OpenOffice - yes you can ! OpenOffice will happily open .wks files.
Using a 16-letter alphabet.
Find a word processing program that you like, such as Microsoft Word, and just start typing.
Tell me who wrote the letter!
Any you wish. MS Word is a software that has no mind and it is only you to decide what you will write using it.
Microsoft OneNote
Yes you can ----------- There is a compatability pack for office 2003 to be able to read and write to the .docx(office 2007) documents.