HP quote for a HA NAS with 40TB was 80k. The reasonable version of that was still 60k
We now have a non-HA NAS with a backup NAS and an off-site NAS.
7 server licenses and the needed user licenses, given the amount of cores we have (40) would be another 15 or 20k iirc, given 15 users. Virtualization with thinclients like we have now, would have been costly as well and likely skipped due to pricing.
I can go on… an will, in my use-case where I will present numbers and make a solid case to drop windows as a small to medium enterprise, if not just in any case.