A Linux server OS that’s had 11 years to improve

“Review: SME Server is pretty much the original ready-rolled
server distribution. Although it has changed hands – and
names – a few times, it’s been around since 1999, when it was
known as e-Smith, a name you’ll still see in a few places.

* Name: SME Server 7.5.1
* Supplier: Free download
* Price: Free, no subscriptions or registration required
* Minimum system requirements: 400MHz P5-class CPU, 256MB RAM, 4GB
hard disk

“In 2001, SME Server was bought by enterprise VOIP vendor Mitel,
which for a while offered unified office servers based around
e-Smith, which it renamed Managed Application Server. Mitel donated
the product back to the community in 2004, where today it is
developed cooperatively by a community based around the
contribs.org website – originally a home for third-party
extensions to the software”