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You have to purchase windows server 2012 enterprise edition and exchange server 2013. Your server running with 32 GB RAM and user grow upto 150 there no issue your hardware.<br />
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If you have the budget to increase ram 32 gb to 64 gb then you can increase your ram.
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You have to purchase windows server 2012 enterprise edition and exchange server 2013. Your server running with 32 GB RAM and user grow upto 150 there no issue your hardware.

If you have the budget to increase ram 32 gb to 64 gb then you can increase your ram.

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my question is answered half way
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Hi, <br />
I am running SBS2011 with exchange 2010 and its time to upgrade the server and Exchange.<br />
Can some one advise best option for the following requirements:<br />
Rapid growing company currently have 70 users can go up to more than 150 users and computers in next two to three &nbsp;years.<br />
<br />
we have ML380 Ge8 server with Hyper V Exsi 5.1 <br />
Servers running with 32 GB memory and can be upgraded to 64.
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Hi, 
I am running SBS2011 with exchange 2010 and its time to upgrade the server and Exchange.
Can some one advise best option for the following requirements:
Rapid growing company currently have 70 users can go up to more than 150 users and computers in next two to three  years.

we have ML380 Ge8 server with Hyper V Exsi 5.1 
Servers running with 32 GB memory and can be upgraded to 64.

Server 2012 and exchange 2013 selection and upgrade

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.