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what version of Exchange you are going to install ??<br />
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Link for Exchange 2016<br />
<a href="https://technet.microsoft.com/en-us/library/aa996719%28v=exchg.160%29.aspx?f=255&MSPPError=-2147217396" rel="ugc">https://technet.microsoft.com/en-us/library/aa996719%28v=exchg.160%29.aspx?f=255&MSPPError=-2147217396</a>
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what version of Exchange you are going to install ??

Link for Exchange 2016
https://technet.microsoft.com/en-us/library/aa996719%28v=exchg.160%29.aspx?f=255&MSPPError=-2147217396 [https://technet.microsoft.com/en-us/library/aa996719%28v=exchg.160%29.aspx?f=255&MSPPError=-2147217396]

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Email is heavy on disk usage and memory (and generally more so than CPU power). <br />
<br />
I would get a Server with a modern CPU, 32 GB of memory or more and lots of disk (multi TB drives in a RAID 10 configuration). The goal is to provide lots of space for Email and for Exchange Archiving (so Inboxes do not get too large). <br />
<br />
Also consider outsourcing email to a good vendor. This is a mature market that works well. We have no Exchange servers left at our clients and that save gobs of time (= money).
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Email is heavy on disk usage and memory (and generally more so than CPU power).

I would get a Server with a modern CPU, 32 GB of memory or more and lots of disk (multi TB drives in a RAID 10 configuration). The goal is to provide lots of space for Email and for Exchange Archiving (so Inboxes do not get too large).

Also consider outsourcing email to a good vendor. This is a mature market that works well. We have no Exchange servers left at our clients and that save gobs of time (= money).

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I understand, but Servers tend to last longer than known email requirements so I always tend to make sure there is adequate resources. &nbsp;Maybe I was a bit heavy on disk, but between 4 and 8 TB total should provide adequate growth.
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I understand, but Servers tend to last longer than known email requirements so I always tend to make sure there is adequate resources.  Maybe I was a bit heavy on disk, but between 4 and 8 TB total should provide adequate growth.

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HP is one good brand you can look for hardware perspective. Below is the link to HP sizing. <br />
<br />
<a href="https://www.hpe.com/h20195/v2/GetPDF.aspx/4AA6-3720ENW.pdf" rel="ugc">https://www.hpe.com/h20195/v2/GetPDF.aspx/4AA6-3720ENW.pdf</a><br />
<br />
Download the sizing tool and enter required data. That should give you the exact requirement.
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HP is one good brand you can look for hardware perspective. Below is the link to HP sizing.

https://www.hpe.com/h20195/v2/GetPDF.aspx/4AA6-3720ENW.pdf [https://www.hpe.com/h20195/v2/GetPDF.aspx/4AA6-3720ENW.pdf]

Download the sizing tool and enter required data. That should give you the exact requirement.

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@Seth Simmons for what reason do you recommend raid 10 over 5
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@Seth Simmons for what reason do you recommend raid 10 over 5

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you prefer ssd over sas (10/15k) because of price or performance?
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you prefer ssd over sas (10/15k) because of price or performance?

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The opposite the ssd are cheaper
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Looking in buying a new exchange server for about 25 mailboxes and will grow to 35 wit in the next 5 years receive a lot of emails (close to hundred) and need help on hardware specifications recommended.
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Looking in buying a new exchange server for about 25 mailboxes and will grow to 35 wit in the next 5 years receive a lot of emails (close to hundred) and need help on hardware specifications recommended.

Recommended hardware specifications for a exchange server

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.

Server Hardware

IT Administration is the processes and best practices for programming and development, and incorporates methodologies for managing activities and projects. Common methodologies include waterfall, prototyping, iterative and incremental development, spiral development, rapid application development, extreme programming and various types of agile methodology. The life-cycle "model" is a more general term for a category of methodologies, and a software development "process" a more specific term to refer to a specific process chosen by a specific organization.

IT Administration

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

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