Who are the competitors of Microsoft Office?

A question from my marketing assignment I need help in. How can this issue be covered?

Thanks.

Who are the competitors of Microsoft Office?norton internet security 2008

Open office.org is the best price

Corel has a suite of programs similar to Office, which I _think_ is Wordperfect Office X something or other.

Who are the competitors of Microsoft Office?spyware removal

Yahoo! Finance mentions Oracle, IBM, CA, and SAP -- see the link below.

I'd also include Apple.

Good luck!