I can confirm. I worked at an AIX and Linux shop for about 4 years in the early 2000's. We had a couple of "enterprise" customers who didn't yet trust Linux for

I can confirm. I worked at an AIX and Linux shop for about 4 years in the early 2000's. We had a couple of "enterprise" customers who didn't yet trust Linux for their critical applications. It was IBM all the way. Note, that for that era, AIX was a very solid choice. Only other real option was Sun/Solaris, which was dying after the dot-com implosion.