Microsoft SBS 2011 Replacement?
 

Could someone recommend a Microsoft SBS 2011 replacement in Linux?

I am going to use CentOS 6.5.

Thanks

Zentyal.
Have a look.
jdk

Thanks for the suggestion.

I looked at it and saw that is is based on Ubuntu - something that I am not willing to install due to spyware claims by Richard Stallman.

Beh, some people claim that because of Unity's search features. I'm not a fan of Ubu, but some claims are just stupid.

If you're going to use CentOS and firm about it, check if Zentyal is a live distribution. Run it. Find out what software it uses (a simple dpkg -l | grep ^ii should be sufficient to give you that list), then install that on your CentOS system - just find the same software in CentOS' repositories. You're going to have to configure stuff, but if you're set on not using Zentyal as-is, it's going to be a bit of work for you.

I can't speak from experience, but ClearOS has a good reputation and it's based on CentOS. It used to be ClarkConnect and it's been around since 2001. Check the reviews listed by DistroWatch:
http://distrowatch.gdsw.at/table.php...bution=clearos