Microsoft Office 2010 beta is available for public download, with the final version due for release in the first half of 2010.
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Office 2010 features Office Communicator 2007 R2, which enables users to synchronise their Windows Live and other social networking site feeds in Outlook.
The Office 2010 public beta is available in 32-bit and 64-bit versions and both include versions of the core Office applications.
Businesses can start testing Office Web Apps, but the consumer version remains in the technology preview stage.
Microsoft has invited users of the Office 2010 public beta to post questions and comments on the company's Technet Forums.
Office 2010 supports collaboration, allowing users to share documents and move files between PCs, the web and smartphones.
According to Microsoft, the product will offer better collaboration, enabling multiple authors to edit the same document.
To aid collaboration over e-mail, Outlook 2010 offers Gmail-style threaded conversations. It allows users to ignore unwanted threads.
Users will be able to edit images directly in Word or PowerPoint. A user interface enables users to work on, print and manage Office 2010 documents in a common workspace.