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One of the biggest user interface changes is that Microsoft has implemented the Office Ribbon User Interface. This should make it easier for end users to find their way around as the tool layout will mirror the look and feel of other Office applications. Major improvements to the UI will allow for things such as the ability to check out multiple documents without going through a page refresh and the ability to easily upload photos without need to upload to a separate library first. These two examples may seem simplistic, but these are just a few items that will make SharePoint more accessible and user friendly.
Microsoft also spent a lot of time helping out those that create and customize sites by allowing you to do a lot of things previously only possible to do in SharePoint designer, now possible to do within the site itself. Examples of this are changing the title page font, and editing text on the site in a WYSIWYG interface with live preview.

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For those who like customizing their sites, SharePoint 2010’s Rich Themes will be welcome. Themes in 2007 were limited to a handful of pre built themes or if you wanted something fancier, you needed to create a custom theme. 2010 allows you to import PowerPoint themes or to build your own, customizing the colors for everything from links to the fonts and background colors used.