Microsoft Office Compatibility Pack

This tool enables users of Office 2000, XP and 2003 to open, edit and save documents in the new 2007 formats in Word, Excel and PowerPoint. Install it and the functionality is immediately available in Office's File Open and Save As dialogue boxes.

www.support.microsoft.com/kb/923505

Noreplyall Outlook Add-in

This tiny extension adds two buttons to the Ribbon in Outlook 2007 and 2010, enabling you to prevent people in the same organisation from forwarding or clicking Reply to all when they get the email you're about to send out.

microsoft.com/en-us/projects/researchdesktop/noreplyall.aspx

Free images and clip-art

Need to jazz up an Office document with some relevant imagery? Thousands upon thousands of free photos, clip art and other illustrations are available at the Office website – download individual pictures through the site or use the Microsoft Clip Organizer tool (part of Office).

www.office.microsoft.com/en-gb/images

Forgotten Attachment Detector

Do you often forget to attach files to important emails? Stop embarrassment by installing this add-on for Outlook 2007 and 2010. It flashes up a warning if it thinks you've forgotten to include attachments with your message.

www.officelabs.com/projects/forgottenattachmentdetector

pptPlex

This tool enables you to zoom into and out of your PowerPoint slides, as well as jump between non-sequential ones. Once it's installed, launch PowerPoint and view the video tutorial to find out how to use it.

www.officelabs.com/projects/pptPlex/Pages/default.aspx

Microsoft Producer For PowerPoint

This free-to-use add-on for PowerPoint makes it incredibly simple to create web-based presentations from existing PowerPoint slides. You can also use it in association with other media sources, such as video, audio and images.
You'll need to use the Microsoft Office Animation Runtime plug-in unless you're running Office 2007 – a handy download link is provided on the Microsoft Producer download page.

www.office.microsoft.com/en-gb/downloads/redir/DC001075497.aspx

Free Microsoft Office Templates

Need some inspiration for, or a helping hand with, your next Office document? Just visit the Templates section of the Office website (see the link above), where you'll find a mind-boggling number of useful options.

They're divided up into dozens of categories, which cover all of the major Office applications, and can be accessed through each of the individual Office programs when you create a new document.

www.office.microsoft.com/en-gb/templates