I have extensive experience with Solaris, IRIX, All of the BSD distributions and Linux. as long as I can get a network login I can manage your machine. below is a list of services I can provide remotely. If you don't see something listed here that you are interested in just give me a call. It is more likely than not that I can do what you require.
A good example would be a postfix,proftpd and courier-imap Installation I did on a customer's Mac OS X 10.2 server. I obtained a copy of OS X 10.2 and the development tools and built them a nice mail/ftp server solution that utilized everything they already had in house and gave them all the capabilities they were looking for, without having to perform a costly upgrade that might severely impact production or spending lots more money on hosting and trusting sensitive data to some outside firm.
As a general rule as long as there is documentation I am capable of installing/configuring and maintaining anything you wish as well as providing advice on and implementation of Open Source software solutions to common(and uncommon) problems.
Even on modern machines some Linux distributions only ship with generic kernels that may not be compiled to take full advantage of hardware specific CPU optimizations and the like. So the system might boot and function properly but not perform as well as you hoped. I may be able to help you in this case with a custom compiled Linux or BSD kernel.