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Writer
Mail merge is simpler. When using Calc as a data source, you don't need a data source definition file – that information is now embedded in the document.
A new Hide Whitespace option has been added to the View menu, which hides the gaps between pages to help you really focus on your content.
A new Sheet menu brings together all common spreadsheet operations, and new context menu items have been added for manipulating rows and columns.
Calc
You can now equalise the widths and heights of multiple objects. Just select them, open the context menu, choose Shapes and one of the Equalise options.
When you're working with enhanced shapes, you can now edit the details of control points via the Position and Size dialog box for much finer control.
Impress
In the Data menu a new statistics dialog for calculating linear, logarithmic and power regression has been added.