Recent data shows that as many as 40 percent of the world's PCs are running Windows XP according to SMB Nation research. Windows 7 has market share of 45 percent and the balance is made up of either older Windows packages or Windows 8 which is still in the single digit stage.
If your business is one of those which is still running XP and related server packages like Server 2003 and Exchange 2003 it is time you start your planning for an eventual upgrade to newer systems.
As of April 8 2014 Microsoft has declared these as end of life products which has serious implications for those still dependent upon these operating systems. Microsoft will no longer release security patches and vulnerability notices for these products of that date. The sense is that April 9 2014 is already circled on the calendars of the black hat hackers who might be looking for vulnerable computers to attack. XP from day one has not had the levels of security that are now built into the newer OSs so to some extent the lack of further protection releases is a double whammy.
Most organizations especially SMBs (small, medium businesses read more here