If you are looking for office software as an alternative to Microsoft Office, then IBM Lotus Symphony would be one of the best candidate. Lotus Symphony consist 3 applications: Lotus Symphony Documents, Lotus Symphony Spreadsheets and Lotus Symphony Presentations. IBM Lotus Symphony can be downloaded for free at symphony.lotus.com
Lotus Symphony have a simple user interface making daily word processor user easily learn it and start to using it. It can open and save documents from and to several formats including Open Document (ODF), Microsoft Office and Open Office so old document still can be opened and edited.
If you have question you can visit Lotus Symphony user community where you can ask question, share document template or download plugins to help you doing tasks.
As Lotus Symphony is free to download, this could save you from buying license for other paid Office software or from using web based office suite which the security of your document can be questioned.