Linux in the state companies?

Question

linux

Any advice on which Linux distribution to choose for a large company?
Distributions are needed for such tasks:
1) For workstations (hardware from sampleron to Core I3, from 512-4GB)
2) For a file server.
3For database server (1C 8.1, Firebird 2.5)
4)For mail server.
5) For a domain controller.
Free distributions are desirable, but not to violate any licenses.

Answer 1

Surely, since the state structure, they will also oblige the distribution from the list of Russian software. Alt, Astra, ROSA, GosLinux, Calculate - depending on personal preferences and qualifications.

Answer 2

AltLinux
ps or AstraLinux

Answer 3

In the state honey. institutions saw installed Ubuntu

Answer 4

Open SUSE, the perfect system in every way. Especially good for supporting this economy in the future because YaST will drag even beginners.

Answer 5

Look at GosLinux by FSSP.

Answer 6

ClearOS - for mail, for domain, for file server with web interface management.

Answer 7

Any... Everyone will write what they like here, but this will not be the best choice for you. I would generally choose this:
1). Some *ubuntu, which one is easier
2). OpenSolaris/FreeBSD
3). Debian
5). Debian
Why? Because I'm used to working with these systems))