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Add Exchange 2010 to SBS Essentials 2011

I have a client that is in an SBS Essentials 2011 solution. They now want to add/host their own Exchange onsite. My question is can Exchange 2010 be installed on SBS Essentials 2011?
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Jaroslav Mraz
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Essentials doesnt include Exchange because they want these very small companies that would use this to use cloud emails services, such as Microsofts own hosted exchange mail service. it would mean that you could go with cheaper hardware as you dont need 4-10GB RAM for exchange.
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But will Exchange 2010 install on SBS Essentials 2011 with adequate hardware?  Their current server has a four-core Xeon CPU and 12 GB of RAM.
If it is SBS then NO you can add it only as update of SBS to Standard or premium
Your options are:
-Continue with SBS essentials and web hosted e-mail
-Migrate to SBS 2011 std
-Install server 2008 R2 standard on a separate machine, join the domain, and install Exchange 2010 on it.

I am not sure if or how the latter will integrate with SBS essentials and will cost double that of option #2.

Though I have no issues at all with your wanting to host on site, I am just curious as to why the switch. It is a common question (cloud vs hosted), and opinions are interesting.
Let me make sure I understand. SBS Standard comes with Exchange 2010 with or without the Premium Add-on package. SBSe does not have Exchange 2010 and it cannot be installed on it at all even with adequate hardware? Is this correct?
Well, RobWill, my understanding is that they did host with Exchange, then outsourced [to Google I think] but did not like how it worked with Outlook, so now they are looking to bring Exchange back. Mine is not to reason why, mine is but to do and die.
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Rob Williams
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Thanks for the reasoning. I tend to favor in-house Exchange but always curious as to others reasoning.

The best integration will be if using Microsoft's Office 365, if they want to continue to use SBS essentials.
I would just like to add my 2 cents into this post, in case others wonder about this.

Windows Small Business Server 2011 ESSENTIALS does not come with Exchange. Also, ESSENTIALS is limited to utilizing up to and no more than 8gb of memory.

While it is possible to add a second Windows server to install Exchange, I would recommend against this. It would in my opinion be better to upgrade from ESSENTIALS to the "standard" Windows Small Business Server 2011, which has Exchange and SharePoint integrated.

Better yet, this scenario would be an excellent opportunity to consider Microsoft Office 365, which includes a very robust Exchange Online solution. I have been using Office 365 for several years, and I am now such a believer that my attitude is to recommend it whenever feasible. It does not fit every organizations' needs, but it is so comprehensive that many businesses can benefit from it.