You can't beat Lotus software. AmiPro was the last with the Smartsuite series and had it a long, long time ago.
You might be able to free up some space by opening the File Manger and click on "This PC" and then right click on "Drive C:". Disk Cleanup is located in that panel, BUT, when you launch Disk Cleanup, at the bottom of its panel, select to cleanup system
files and you will additional check boxes appear in the list.
Some of those update files do not clear off like they are supposed to and you will see them there taking up space.
As for Windows 10, it is still a beta system right now and not complete. Unknown what the final version will have but will find out sometime around noon on July 29th. At least Windows 10 is not eating up the power. My Pro 3 (i3 model) normally gets about
6.5 hours per charge. I am still getting that with Windows 10 TP. Solitaire, by the way, is going to come with it and another program 'may' come with it as standard called "3D Builder" and you may want a 3D printer after you play around with it.
Myself, what I did was put in a 64GB micro-SD card and moved all data files onto it plus I also have two programs where I re-directed the installation to go onto the card. That way, I am keeping Drive C: as clear as possible.
As for office suites, I have LibreOffice and Microsoft Office 2016 Preview. The Windows 10 Store also has Metro UI Preview apps for Word, Excel, and PowerPoint also (may also have Outlook but didn't check). They function the same as the iPad/Windows Phone/Android
apps. Those programs are individual and not bundled as a suite.