Upgrading servers from Windows Server 2003 Standard to current Small Business editions

I currently have an environment consisting of two servers; both running Microsoft Windows Server 2003 Standard. One server serves as the Domain controller while the other server is used as the Web server. I am looking to upgrade my environment, but I was wondering if it was best to use only one server running the current edition of Microsoft's Small Business Server or better to keep a dual server environment. Any ideas would be greatly appreciated.
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Small buisness Server is a single point of failure. recommended keep 2 servers.

But as far as I remember small buisness server alow for one member server, if this is the case, then this could be a good option, to install SBS, with one member server.

One server only make your IT weak.
Brian PiercePhotographerCommented:
The migration from Server 2003 to Server 2008 is straightforward and for this reason alone I would stick with Standard Server rather than SBS server, If your Web server is used for external clients then the argument becomes even more compelling as it would avoid the need to expose your DC to the outside world.

That said, if you have only internal clients SBS server may be more cost effective, however, whichever solution you opt for I would paln to have at least 2 DCs for fault tollerance and for ease of recovery from a server failure.
Lee W, MVPTechnology and Business Process AdvisorCommented:
If you want Exchange Server, go with SBS.  If you don't, then DO NOT go with SBS.

Assuming you want to use Exchange, first, confirm the following:
1.  You do not need trusts with other domains
2.  You do not need more than 75 users/device
3.  You have a 64 bit capable server with AT LEAST 8 GB of RAM

Assuming the above is true, then go SBS.  

To clear up some myths...
You CAN have additional servers in an SBS domain - you just cannot have more than one SBS server in the domain.
You cannot have the SBS server be a terminal server.  
You CANNOT run Hyper-V on the SBS Host - you can install SBS in a VM, but not has the host OS.  
Other than that, there is no restriction on additional servers or what the SBS server can do.

Having multiple servers is generally best, but not always economical.  If possible, you SHOULD have two DCs and DNS servers for redundancy, but if it's cost prohibitive, it's not required.

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