What happens after Windows XP support ends?

Your only options are to upgrade or to use the website with a compatible browser.

No, we also have the option of deciding not to give Dropbox our business.  It's called "voting with our feet" and it has caused many a company in the past to regret certain business decisions.

Or not I'm afraid. They will have worked the numbers out and unless you are a paying customer then leaving will save them cash as you are not storing data. 

That and less OS's to support = less development costs = less staff = more ££$$€€

NOT A HAPPY XP USER HERE...

I don't see the point to drop XP as you can't update XP via Microsoft anymore then there are not going to be any support costs for Dropbox, Please just leave it alone..

Its precisely because Microsoft are not updating XP that its becoming harder and more expensive to support - in development terms, XP is diverging from the standard Windows environment with each update to Vista, Windows 7, Windows 8 and Windows 10, to the point where building a client that supports XP as well as the others takes an unrepresentative amount of time and effort. That point has been passed and the decision to drop XP support has been made.

On my Windows 10 desktop, I must run a VMWare workstation running Windows XP so that my beloved desktop publishing program Ventura Publisher 10 will work.  Of course, I can access Dropbox via my Windows 10 operating system, but I'd rather access it from XP for my own convenience. Dropbox should not further enable and support Microsoft's irresponsible development of Windows such that the newer iterations of the program will not run superior programs such as Ventura Publisher (despite its abandonment by Corel) that are needed by professionals like me.

William, surely your problem is with Corel, who abandoned the product you want to use?  If they hadn't abandoned it, it would have been updated to work on Windows 10...

Yes, a problem is with Corel, but the general acceptance, including Dropbox's acceptance, of Microsoft's evolution of the Windows OS so as to create obsolescence should be unacceptable and discouraged. Why make Dropbox useless to XP users?.

Dropbox is dropping XP support because it has started to cost them more to support it than the revenue they get from supporting it.  Simple really.

And I disagree with your comment about Microsoft "creating obsolescence", if you look at *any* of the alternative operating systems, old operating systems get dropped by their creators.

Apple won't support anything older than OSX 10.11.

If you try and use a 2.2 Linux kernel you are on your own for getting stuff to work.

The world moves on, software moves on, and if you dont move on with it then you get left in the cold.  Its got nothing to do with deliberately creating obsolescence and everything to do with dumping baggage that just gets in the way.