Re: I'm still using Office 2000
I'm not sure you did buy it, just a license to use it, it's old so the T&C may be different, but as far as I can tell you still don't own the software , which leaves the only alternative that you are already renting it for a one time charge :)
Personally I use Libreoffice and Kingsoft Office, between them I can do all the docs etc I need on any platform I use ( Linux, Win and Android ) and I rarely have an import problem and if I do then it's no different than someones new shiny Office software generating a format that isn't compatible with my older software - which happens in business to business a heck of a lot.
I've lost track of the number of times when using office 'Office" that I had to write back and ask for a downlevel saved version because the company I was working in hadn't shelled out / rolled out the Latest suite.
As for cloud based solutions, try working in a somewhat rural setting, or on a plane, or even another country where free wifi is not a viable option - right now you won't get a lot of work completed, data roaming charges are usually exorbitant, and dependent how locked down your equipment is you may not be able to get a local sim with a far better data expense.
Did I remember reading that Google docs no longer supports older Word formats ? not sure, but I bet there are a squillion documents in the old formats archived away...
Libreoffice can be run from a memory stick as a valuable backup tool, I never did find a way of running Office that way, although Lotus Notes can run that way, just alter notes.ini to reflect the drive letter of the mem-stick when it's assigned after you plug it in.
Haven't used Symphony for a long time, but with their latest fix pack it should access .xls, .xlsx, .docx or .pptx.
I'm not anti-windows / office, I just found this to be my best alternative while giving me compatibility and flexibility, and of course, saving the software costs for something else.
I primarily use Linux as I have less hassle with hacking, virii, port probes etc etc, and it's faster too, I have Windows [Licensed] running in a VM for those things there is no equivalent for yet on Linux. ( Free or Fee ) .