The iPad apps need to be created specifically for the iPad, it will not run standard software, and as yet there is not a version of Open Office available for the iPad.
NOTE:
it will open something made with Microsoft's Office (thus also an Open Office document) using Pages,KeyNote,Numbers which are part of the iWork suite.(I suppose that iWork is not included,you'll have to buy it).
iPad does not support MS Excel, however a good work around I've found is AlwaysOnPC. Their iPad app lets you open, edit and save excel, word, powerpoint, and even images. For an overview see related links.
Yes, you can get versions of Excel that run on an iPad.
If you want to open Word files, get Pages. If you want to open Excel spreadsheets, get Numbers. If you want to open Powerpoint presentations, get Keynote.
Yes.Yes.Yes.Yes.Yes.Yes.Yes.Yes.Yes.Yes.Yes.
You sure can! You can also run Microsoft Office files with Openoffice. Microsoft office will run Openoffice files in compatibility mode, with very minor differences if any.
Yes, OpenOffice.org can run on Linux and some like Ubuntu include this office program.
The free office accounting software I know about are Libre office and Open office. They are both based on the same open source software and depend of java to be installed to run correctly.
yes it will run citrix
Yes. There is an option to run QuickBooks on an iPad. See related links for details and download the app.
No
iOS 7 Can't run on an iPad 1. The hardware is simply not powerful enough to run the operating system. I believe iOS 5 is the newest OS that will run on the original iPad.
The iPad cannot run Windows applications it can only run apps specifically written for it. There is an iPad app, VMWare View for iPad, which connects to a Windows system and allows the user to use Windows applications via the iPad.
iPad apps are created to work on an iPad and will not work on a PC.
It will turn on automatically.