Availability, price and employee familiarity often determines which operating systems are offered on dedicated servers. Variations of Linux and Unix (open source operating systems) are often included at no charge to the customer. Commercial operating systems include Microsoft Windows Server, provided through a special program called Microsoft SPLA. Red Hat Enterprise is a commercial version of Linux offered to hosting providers on a monthly fee basis. The monthly fee provides OS updates through the Red Hat Network using an application called Yum. Other operating systems are available from the open source community at no charge. These include CentOS, Fedora Core, Debian, and many other Linux distributions or BSD systems FreeBSD, NetBSD, OpenBSD.
This is where an email host like SiteGround can be a winning deal for individuals. SiteGround will give you a free domain name, where you get unlimited email hosting that’s compatible with most all major email and webmail clients (RoundCube, Outlook, SquirrelMail, etc.). Your email is secured with integrated anti-SPAM protection, and you can easily manage your account via cPanel, the web’s leading control panel for hosting.
If you’re a startup or a small- to medium-sized business, iPage offers low-cost options that are great for small or growing companies on a budget. With your free domain name registration, you get hosting for unlimited domains and emails, plus $150 in free advertising credits, should you need to market a new website as well. The host’s email tools include webmail, autoresponders, email forwarding, and security features like SPAM filters and virus protection.
Many dedicated server providers include a service level agreement based on network up-time. Some dedicated server hosting providers offer a 100% up-time guarantee on their network. By securing multiple vendors for connectivity and using redundant hardware, providers are able to guarantee higher up-times; usually between 99-100% up-time if they are a higher quality provider. One aspect of higher quality providers is they are most likely to be multi-homed across multiple quality up-link providers, which in turn, provides significant redundancy in the event one goes down in addition to potentially improved routes to destinations.
A dedicated hosting service, dedicated server, or managed hosting service is a type of Internet hosting in which the client leases an entire server not shared with anyone else. This is more flexible than shared hosting, as organizations have full control over the server(s), including choice of operating system, hardware, etc. There is also another level of dedicated or managed hosting commonly referred to as complex managed hosting. Complex Managed Hosting applies to both physical dedicated servers, Hybrid server and virtual servers, with many companies choosing a hybrid (combination of physical and virtual) hosting solution. There are many similarities between standard and complex managed hosting but the key difference is the level of administrative and engineering support that the customer pays for – owing to both the increased size and complexity of the infrastructure deployment. The provider steps in to take over most of the management, including security, memory, storage and IT support. The service is primarily proactive in nature.[1] Server administration can usually be provided by the hosting company as an add-on service. In some cases a dedicated server can offer less overhead and a larger return on investment. Dedicated servers are hosted in data centers, often providing redundant power sources and HVAC systems. In contrast to colocation, the server hardware is owned by the provider and in some cases they will provide support for operating systems or applications.[citation needed] 

The reason I ask is due to Barbara’s question about changing email provider as she has her own business domain, a web site and emails ending (say @xxx.com). If she changed email provider then using your analogy, then the hard-working mail team might be a team of contractors handling all her mail and then if she changes to a different provider then that would be equivalent to the old team being fired and new team of contractors put in their place. So same address, same building, same mail boy delivering it to your desk but a new mail room team. Would that be correct?

Microsoft offers software licenses through a program called the Service Provider License Agreement. The SPLA model provides use of Microsoft products through a monthly user or processor based fee. SPLA software includes the Windows Operating System, Microsoft SQL Server, Microsoft Exchange Server, Microsoft SharePoint and shoutcast hosting, and many other server based products.
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