A lot of the banks have been migrating their existing applications on to grid, their batch type calculation applications for risk/reporting etc, are ideal if configured in the right way for grid. In the short term, if the application is windows based, it makes sense to keep it windows, however, in the long term, more banks are moving grid to linux. Why I here you ask, well (from a windows engineer this is rare but), you haven’t got the random windows type errors. For example, oracle client installing but not really, security patching (at the moment less of an issue on linux), registry/dll problems, yes you might be able to rebuild the windows box in 35 minutes, but in my experience linux is a bit more hands off. You build it, install the layered components, and again in binary form, it either works or not. We had problems with the oracle client being installed but not recognized, or ingres installing but not registering correctly with the bank application, again issues which might have been that bit easier without the windows aspect.