What communication softwares are used in current office?

In todays' office, the dominated office work software is still Microsoft Office Suite, such as Microsoft Word, Microsoft Excel, etc. And IBM Lotus Series also play important roles in certain companies. And since Mac and Unix-like opensource operating systems are more and more important players recently, the impact of their office system such as iWork, OpenOffice on future office should be also accounted. Futhermore, web-based office softwares such as Ajax13,Google Docs & Spreadsheets, ThinkFree Office Online,Zoho Office Suite also showed a great potential.

Please see also http://en.wikipedia.org/wiki/Comparison_of_office_suites