moving mailbox from SBS 2008 Exchange 2007 to different Domain's Exchange 2010 platform


I have a Small Business Server 2008 running Exchange 2007 in domain called "ABC".

Due to the limitations on Small Business Server 2008 we are unable to create a trust relationship to another Windows 2008 DC in domain called "DEF"

We would like to move mailboxes from the Exchange 2007 platform (domain ABC) to the other Exchange 2010 platform. (domain DEF)

Please can you advise how best to do this ? I understand there are several ways, we have approx. 70 users to do with the mailbox database around 140GB.

Many thanks
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You need to export your mailboxes and import them in 2010.

Had you upgraded your existing domain by adding another DC and installing Exchange 2010, you may have been able to do this easier.
bhangrageezaAuthor Commented:
do you know the process to export? presume this is a PowerShell script that copies their mailbox data to a PST ?

I have not upgraded domain ABC domain controller as we are looking to trash this, the work involved to upgrade it and install exchange 2010 could be offset with doing the task above.
Cris HannaSr IT Support EngineerCommented:
I you misunderstood the term upgrade.  He was not suggesting an in place upgrade of the existing server, but rather that you install the new domain controller into the SBS domain.  Replicate the AD to new server, Move data to new server.  Then install new box with Exchange.  now you can use the move mailbox wizard.   And user profiles remain intact
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bhangrageezaAuthor Commented:
Hi Cris

Thanks for the reply.

To confirm, I should install a Windows 2008 R2 Server into the SBS domain(ABC domain) and promote it to a DC replicating all AD instances over. Then install a new box with exchange and then move exchange mailboxes out into domain DEF ?
Cris HannaSr IT Support EngineerCommented:
That is the recommended method, correct.
bhangrageezaAuthor Commented:
I presume by promoting the 2008 r2 server we are raisin the domain to a 2008 r2 level or keeping it as is ?
Cris HannaSr IT Support EngineerCommented:
The domain level and Forest Level will remain the same    After SBS 2008 is removed from the domain you can raise the level if desired.
bhangrageezaAuthor Commented:
are we able to create a trust relationship using the 2008 r2 AD ABC domain to domain DEF?
Cris HannaSr IT Support EngineerCommented:
No.  SBS does not support trusts at all
bhangrageezaAuthor Commented:
Hi - When I move the FSMO roles from Windows SBS to Windows 2008 R2, is there a grace period that is initiated by the OS?
bhangrageezaAuthor Commented:
Hi Guys,

Just an update here.

Once I moved the FSMO roles of the SBS to a Windows 2008 R2 server in the same domain I was able to create a trust, and move AD/Exchange over to our new domain.

No grace period kicked in and the old server was demoted, and re-named as the backup file server.

I know MS has a stance that we can't migrate SBS, but we did and it was easily done.

Thanks for your help.

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bhangrageezaAuthor Commented:
My solution differed to the comments above from members.
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