IBA, in its advisory, drew the attention of the banks to a study by Microsoft, which estimates that over 34,000 branches of public sector banks would become vulnerable following the US-based firm's decision to stop support to Windows XP.
The fiscal impact of this could be as much as a loss of business opportunity worth Rs 1,100 crore in a day and a loss of income worth Rs 330 crore over a period of 3 days (assuming that a major incident may take 3 days for the systems to come up to normal functioning), the study had said.
Windows XP -- launched in October 2001 -- is three generations behind the latest operating system Windows 8, which was launched in October 2012, it added.
"We request you (banks) to kindly arrange to take cognizance of the news item and take steps as may be necessary to mitigate the risk of disruption in banking services," IBA Deputy Chief Executive K Unnikrishnan said.
Welcoming IBA's advisory, Microsoft said such a step will further act as a catalyst in encouraging banks to change their operating system, he told PTI.
"It seems banks are being dismissive about the risks that are involved here. Some vendors are also less cautious on this issue. We also have special offers for banks to encourage them to upgrade their systems," Goyal said.