"Foundational" business software

You're absolutely right on this point. I've gone through the process of 
setting up basic LDAP, mail, samba and SSO service for a 20-employee 
company on Linux, and while it wasn't prohibitively difficult, it was 
fairly time consuming. This is coming from someone who does a lot of C and 
Perl development and that even happens to have his name on a (small) patch 
in the kernel. If it takes me a lot of time doing the necessary 
integration work, what does that say for a former Windows admin?