If you happen to be running your own server system, you would not have to consider what operating system to use for hosting your websites. That decision would already have been made. Part of that decision making process may, however, have involved consideration of the features that would be available to you for your websites. Other considerations may have involved other system features as well as cost, ease and convenience. Those aspects which concern your websites are the same operating system considerations to be born in mind when selecting a hosting service for your sites.

The vast majority of hosting services being offered today are based either on Windows or Linux. There are a few other Unix variants used in hosting companies, but for the most part the features offered to the guest website are so similar that they can be thought of as the same. For the purposes of this discussion, "Unix" systems will be lumped together and a Linux model will be considered. There may also be hosting services based on another operating system altogether, but these are few and far between. For those systems, you would have to compare their feature sets to those discussed here.

Second to the operating system, the most important influence on the features that will be available to you will be the Web Server system in use. On Linux systems, the Web Server offered is almost always the Apache server. On Windows it's the Internet Information Server (now "Service"), IIS. Apache is also available for Windows systems, but is not very frequently used by hosting companies using the Windows platform. Again, there are other Web Servers in use but the great majority of hosting companies use one of these two.

No matter which platform you select for hosting your site, there are some things that are common to all. All web servers are (or certainly should be!) configured to support HTML files and JavaScript. It is also reasonable to expect that every system offering hosting services these days also has an outgoing mail server (SMTP Server) set up and available to you. The lack of this could be a problem for you.

While their name suggests that are for enabling the use of FrontPage, the extension in fact provide a set of capabilities that is utilized by a wider range of software. FrontPage itself is a very useful web development tool; especially for someone with a less intimate knowledge of the actual codes used in website creation, but the server extensions also provide a number of utility functions that the website can take advantage of and they provide for a "post" method that allows a program (such as FrontPage or Visual Studio, among others) to "Open" the live site for updates. These extensions, which can be a very important feature for you, can be installed on either a Windows or a Linux server though recently Microsoft has withdrawn all support for running Server Extensions on Linux.

If you are not doing live updates via the extensions, nor using the FrontPage style HTTP import and export, then you will need a means to upload your pages and other website files to the server after you complete them. The most common way to accomplish this is via the "File Transfer Protocol" (FTP). From the System Administrator's perspective, there are differences in the ease of setting up FTP for individual users that tend to make it more commonly available of Unix servers than it is on Windows. If FTP is important to you, you will want to check specifically for this feature.

While Telnet access can be provided on a Windows server, it almost never is. Far more common on Unix servers (which is where it originated) it is, however, quite rapidly disappearing from them too because of security considerations. Telnet is useful to you if you are familiar with the Unix or Linux command line utilities and commands and wish to use them for controlling or manipulating your files. Almost everything you do with your site through a Telnet session can be accomplished by other means, which means that the availability of this feature may not be of particular importance to you.

ASP and the newer ASP.NET are native to Windows. They provide, among other things, access to Visual Basic and the VB Scripting language. There are hosts who port ASP to Linux, but it is very rare to see it offered by a hosting company running Linux servers. ASP.NET holds a great potential for the future of the web, providing features that greatly extend the capabilities that web developers can offer to their clients. A decision to utilize ASP or APS.NET may be a deciding factor for you in the choice of platform you look for in a hosting company.

MySQL is a common database on Linux based servers these days. It is also available for Windows and is starting to appear on the list of offerings from more and more Windows based hosting providers. Access, as a Microsoft product, is available for Windows. Other databases, including the large database systems such as SQL Server and Oracle can be accessed through interfaces such as ODBC. There are also ODBC connections to such system as the IBM AS/400, which is fairly common in medium sized businesses. These interfaces, which are fairly specialized, are more commonly available on Windows systems, and in the offerings of hosting companies are usually special request or custom solutions. If you have a need for such a connection, you will need to talk to the potential hosting service representatives.