In case you want to offer SAAS Office, besides Office 365 and Google Apps, there are 4 other office suites. ZOHO, OX, Think Free (java based), and Live Docs (flash based).
OX is open source and "OX offers files, email, address book, calendar, tasks, and even a social portal where you can easily keep up with your Facebook and Twitter accounts from within the OX Portal." [blog]
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