Can you restore Exchange 2010 mailboxes to Exchange 2003?

I have a client running Exchange 2003 on an ESX 4.1 server and I want to upgrade them to Exchange 2010. Their production host servers can run 64-bit vms, but their disaster recovery servers can only run 32-bit vms. Is it possible to restore Exchange 2010 mailboxes to an Exchange 2003 server in the event that I am forced to use a disaster recovery server? If it is possible, can you direct me to some detailed instructions? Everything I found talks of restoring Exchange 2003 mailboxes to Exchange 2010, not the other way around.

Thanks for your help.
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
If the DR servers can only run 32 bit machines they must be VERY VERY old. Everything has been 64 bit for at least five years. If we are talking about virtual machines it could just be that the VM extensions haven't been enabled in the BIOS - without those enabled you cannot have 64 bit virtual machines.

To answer the specific question, no you cannot go backwards in versions for DR purposes, and the PST export method is a very poor DR. It would be a much better option to get the DR site upgraded and use a DAG to replicate the data live.

Lior KarasentiConnect With a Mentor Commented:
I think your only option is 3rd party tool like edb to pst
MAS (MVE)Technical Department HeadCommented:
please check this site for once off conversion  for few bucks as this is the only option.
Making Bulk Changes to Active Directory

Watch this video to see how easy it is to make mass changes to Active Directory from an external text file without using complicated scripts.

Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
No, Use ExMerge to Export the Mailbox to a PST, and then attach the PST to Outlook, and copy their email to their Exchange 2010 Mailbox.
fisher_kingAuthor Commented:
Thanks for all the replies. I am still considering my best option.

Sembee2, the DR server is about 7 years old (Dell PE 2800). It can run a 64-bit OS, but I was told it cannot run a 64-bit vm - I'm guessing it does not have the ability to enable them in the BIOS, but I will verify this.

Thanks again
Simon Butler (Sembee)ConsultantCommented:
At that age it is probably right on the edge of the technology change, 64 bit VM is about five - six years old. Although I would be hesitant to depend on anything that old, it is well past end of life.

fisher_kingAuthor Commented:
Your solution made me realize that I could use Recovery Manager for Exchange to turn the mailboxes into PST files.

I do not consider this viable since it would take too long and be too costly in a DR situation.

Although your solution is similar to liokr's, it fills out for me how I might complete the PST migration (I would probably use Exmerge to convert back from PST instead of doing it manually).

Ultimately, I agree with Sembee2 that it is not a realistic DR solution. But thanks again for the ideas to help me flush it out.
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