The bank, which is one of Australia's smaller banks with 250,000 customers, does not have any bank branches. It is currently undertaking an AU$57 million technology transformation program.
ME Bank's enterprise architect Jem Richards said that after the bank examined the costs between the two platforms, including the cost of providing tech support, ultimately decided that the Windows Server 2012 and SQL Server 2012 option would be cheaper.
"Although the alternative Linux-based platform is essentially free to deploy, based on our past experience, we knew that it would cost more to support than Windows. This made the overall costs of the two operating systems approximately the same," he said in a statement.
"In addition, Microsoft and Windows community specialists were readily available to help us configure Temenos T24, whereas finding the relevant skills for the alternative platform with Temenos was proving to be a lot more difficult."
Richards said that the unnamed Linux platform would cost AU$100,000 more to upgrade, while the Microsoft licence would require no additional cost over five years.