I was a bit surprised about Microsoft announcements that MS-SQL-Server is now avaiable for Linux, because there was a statement "once upon a time" - before sql-server comes to Linux the hell will freeze all over said Microsoft..
Hmm, now MS-Server 2017 runs on Linux x64 and hMailServer 5.6.6 can use it as Remote DB
dravion@ubuntu16:~$ uname -a
Linux ubuntu16 4.4.0-93-generic #116-Ubuntu SMP Fri Aug 11 21:17:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
dravion@ubuntu16:~$ systemctl status mssql-server
● mssql-server.service - Microsoft SQL Server Database Engine
Loaded: loaded (/lib/systemd/system/mssql-server.service; enabled; vendor pre
Active: active (running) since Fri 2017-09-01 16:03:36 CEST; 28min ago
Docs: https://docs.microsoft.com/en-us/sql/linux
Main PID: 958 (sqlservr)
Tasks: 143
Memory: 1.6G
CPU: 50.231s
CGroup: /system.slice/mssql-server.service
├─ 958 /opt/mssql/bin/sqlservr
└─1044 /opt/mssql/bin/sqlservr