Exchange 2003 Standard to 2007 Enterprise Upgrade - Advantages/Disadvantages?

We presently have Exchange Server 2003 Standard and are thinking of upgrading to Exchange Server 2007 Enterprise as our employee numbers have doubled to 160 over the last year.  We just need advice from anyone who has done a similar upgrade on any potential pitfalls or advantages?
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sparkofgeniusAsked:
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cjohnsen2Connect With a Mentor Commented:
The most important consideration is that Exchange Server 2007 runs only on 64-bit Windows.  You can't upgrade only Exchange, you'll also need to upgrade the server OS, and probably the hardware it runs on.  You also can't do an in-place upgrade on it, even if you are already running a 64-bit OS.

My recommendation would be to get a new box, install 64-bit Windows Server on it, install Exchange 2007, move the mailboxes over to the Exchange 2007 server then decommission the Exchange 2003 server.  That's what I did, and it worked pretty well.

Hardware suitable for running Exchange 2007 is expensive.  If you don't want to or can't spend the money on a new server, you might be better off upgrading to Exchange 2003 Enterprise.

Ask yourself what you want from this upgrade.  If the answer is only "to support more users" and Exchange is otherwise handling all of your needs, then upgrading to 2003 Enterprise might be the ticket.
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dwpvsupportConnect With a Mentor Commented:
Here is what I did to upgrade. If you do not use public folder then you will be ok. IF you are useing public folder then I would start migrating them out of the scheme.  

Once I figured that out then I purchased a new 64-Bit windows server and installed windows and Exchange and joined it to my Exchange Org.  Migrated a few mailboxes over to the new server and ensured that all was working ok.  Once that worked I migrated all the rest of my accounts over and then created new internet connectors and removed my old 2003 server from the org.

But rememebr if you are just upgradeing because it's new, maybe you should wait until SP1.  I did it for the following reasons.  Improved Web access and able to access share drives from OWA.

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SembeeConnect With a Mentor Commented:
You don't need to upgrade to Enterprise edition of Exchange 2007 unless you want the clustering options.
If you just want to go over the 75gb limit the Exchange 2007 standard will be fine. It has an unlimited database size, like Enterprise does in previous versions.
You will need to purchase new CALs for Exchange 2007.

As for the cost of the hardware, well most server hardware for the last two years has been 64 bit, so it is now the cost of a regular server.

Simon.
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sparkofgeniusAuthor Commented:
Thanks guys, every angle covered here
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