Cross Skilling Across Multi-OS Platforms?

drtheman asks: "I have been working in the IT industry for the last 10 years, 7 of those as a UNIX system administrator. I have been noticing over the last year or two that companies are becoming very pedantic about specific skills that a UNIX sysadmin should have. Most troubling for myself is the so called multi-skilled UNIX/NT administrator. It's a given that any seasoned UNIX admin should have *some* Windows knowledge, and cross skilling is something that shouldn't be balked at. However, after coming from large enterprise environments, where the UNIX boys do the UNIX stuff and the NT guys do the Windows stuff, I just find it a little troubling that if I don't adapt with certifications in these platforms I may become unemployable. Do other enterprise admins think that this is too much for us to take on, and companies are just expecting more bang for their buck these days? I can understand that these multi-skilled people are needed in the smaller shops, but I would like to know how it would work effectively in larger ones."