Security across different platforms is an ongoing problem for administrators. Interoperability is a logical solution to the issue, but is dependent on software developers and is hard to come by.
Recently, a group of developers in Ottawa, who provide software to the government, have pledged to make their software security interoperable. They have even gone so far as to create a group: "Announced Wednesday, the Secure City Technology Alliance aims to capitalize on the increased security concerns since 9/11 for automated surveillance integrated with communications systems."
For more on this, see this article.