It is true that a good Linux SA is harder to find and any SA that understands and manages enterprise type LDAP and can implement and manage security for a few hundred servers by himself/herself should be expensive. I have been working in big shops with highly mixed OSes (HPUx, Solaris, Tru64, AS/400, Linux, Windows) for a long time and I think it is the junior Windows SAs that are giving Windows/Linux a bad name and these silly assumptions and name callings. It may be true in HSBC's case that Linux TCO is higher because of specific requirements and their outsourcer doesn't want to pay for 6-figures salary SAs to run the shop...
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It is true that a good Linux SA is harder to find and any SA that understands and manages enterprise type LDAP and can implement and manage security for a few hundred servers by himself/herself should be expensive. I have been working in big shops with highly mixed OSes (HPUx, Solaris, Tru64, AS/400, Linux, Windows) for a long time and I think it is the junior Windows SAs that are giving Windows/Linux a bad name and these silly assumptions and name callings. It may be true in HSBC's case that Linux TCO is higher because of specific requirements and their outsourcer doesn't want to pay for 6-figures salary SAs to run the shop...