Saturday, July 22, 2006

Misconception moment: Exchange 2007 64-bit versus 32-bit

I am being asked this almost every day. "Is Exchange 2007 ONLY 64-bit?" Well, YES and no. There is a 32-bit version that is to be used ONLY for testing, evaluation, labs, classrooms, demostrations, etc... It is NOT very well optimized and is NOT supported in production. I don't know how it will be distributed once Exchange 2007 RTMs, though.

Any server that will house production users or be part of your production organization (mailbox, hub transport, client access, or unified messaging servers) MUST be 64-bit servers (x64 architecture, not IA-64) running Windows 2003 64-bit. Read the Microsoft Exchange 2007 System Requirements page.

In place ugprades are NOT supported, so you will have to have at least one spare piece of hardware to start doing your migration. Most any server that you have purchased over the last year or two should have the x64 extensions,

What will the 64-bit architecture "buy" you?
My opinion: If you run a single Exchange 2000/2003 with a few hundred mailboxes and have no high-availablity features in play (such as clustering or disk replication), then probably not much. The 64-bit move for Exchange 2007 means "more RAM". That translates in to better performance, more efficient disk I/O (which is where larger servers have problems), and the ability to add more features that require improved I/O. Exchange 2003 is quite simply maxed out as far as what it can do; it is constrained by the amount of RAM it can access and therefore has to "go to disk" too often on a busier server.

With more RAM available to Exchange and the database engine, I/O is better optimized, and new features such as continuous replication (local continuous replication (LCR) and clustered continuous replication (CCR)) and per user 'safe sender'/ 'blocked sender' lists can be included.

Is Exchange 2007 better? Heck yes! I have a couple of customers that are already budgeting for migrations to not only Exchange 2007, but Office 2007 in the next year (provided there are no nasty show-stoppers in the RTM version.) 64-bit is a VERY small price to pay for some of these new features and it allows Exchange to move in to the 21rst century with respect to CPUs.


At 9:31 AM, Blogger Notes said...

So... If we're just doing development, and we want to just run an Exchange 2007 server on some old hardware with maybe a dozen accounts to work with... Where exactly do we go to get this 32 bit version? I don't see it on the MSDN subscriptions downloads.

At 1:59 AM, Blogger Nick said...

So Can I run my old 32 bit applications on a 64 bit my antivirus ?

At 11:36 PM, Blogger Bicky said...

I thought i would get comparison of 32bit and 64bit Exchange.. as the heading suggest Exchange 2007 64-bit versus 32-bit....

but all i got was ...

There is a 32-bit version that is to be used ONLY for testing, evaluation, labs, classrooms, demostrations, etc... It is NOT very well optimized and is NOT supported in production....

WHAT ABOUT COMPARISON.. What is not available that restrict it to be used in production environment?????

Please visit the following Link for Comparison..What 32 bit can do and what it cant.,289483,sid43_gci1256194,00.html


At 8:03 AM, Blogger Marie said...

To use the 32 bit version (for evaluation only) download the 32 bit evaluation version available on the Microsoft site. You will have a product id provided to install it. When you install it, it states that it will expire in 180 days, but it does not. You will continue to be prompted, but it will not expire. That is also documented on the Microsoft Exchange eval site.

At 7:44 PM, Blogger Farhannaseem said...


I want to migrate my emails from Exchange Server 2007 (32 bits) to Exchange Server 2007 (64 bits). Can anyone help me in this regards ? please tell me an easy way to do so



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