Didn't see it posted yet, so here goes..

read the article here

Technical and support fears are holding back enterprise adoption of Linux, according to AMR Research.

The analyst's Linux: Creeping into the Enterprise report suggested that companies perceive Linux as still not suited to mission-critical applications.
Luckily the company I work for has all servers (including samba as NT Domain controlers) on linux...

That makes us an early adopter. It does according to this article !!