Windows 7.
Windows ME.
What is windows predecessor is a common clue used in crossword puzzles. The answer is sometimes DOS and other times MSDOS. DOS is an acronym for Disk Operating System.
Windows 8 has very similar system requirements to it's predecessor, Windows 7. Windows 8 requires a 1ghz processor, 1gb (32 bit) 2gb (64 bit) of RAM, 16gb (32 bit) 20gb (64 bit) of hard disk space, and a Microsoft Direct-X 9 compatible graphics card.
The smallest 8-digit number is 10,000,000. Its predecessor is the number that comes just before it, which is 9,999,999.
A newsreader program is used to read and post to Usenet newsgroups, a predecessor of online forums. Forte Agent is a newsreader program for Windows XP through 8.
Windows 7 was released quickly by Microsoft likely due to intense negativity to its predecessor, Windows Vista, which was very unpopular with many people.
Major support ended for the Windows XP operating systems as of April, 2014. The system is now legacy and largely unsupported by the OEM. Editions of XP included Professional and Student. XP was/is the predecessor to Windows Vista, 7, and the current (as of July, 2014) 8.
There is no Windows 8.
Windows 8 is commercial. You need to by a Windows 8 book.
There isn't any Windows 7.8, but if you were referring to Windows Phone 7.8, it cannot be updated to Windows Phone 8 (note that I did not say Windows 8 because Windows 8 is for laptops, desktops and some tablets).
predecessor of
Windows 8 is not released yet.....