E2K3 Mailbox Movement on E2K10

Hi,
My current mailing infra is running on Exchange 2003 enterprise edition with SP2. now we are planning to upgrade it and already upgrade OWA to CAS 2007 but i m planning to install mailbox server on exchange 2010 as DAG is far better than CCR so my question is

Can i move my existing exchange 2003 maiboxes directly on exchange 2010 ?
pdixit1977Asked:
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AmonPereiraConnect With a Mentor Commented:
I understood.

The point is, you can use CAS 2007, but you might extend schema domain to support 2007 and then extends again for 2010.

Exchange Server 2010 Std do supports 5 DBs in DAG, but the price difference is so few and 5 DBs will be a limitation, because if you are moving from Exchange 2003, you might have to move Public Folders, so you only have 4 DBs to use.

In day-to-day operations it might be a problem as you start growing and adding mailboxes and some mailbox maintenance after migration as trying to keep your databases managed.

Dont forget to keep Windows Server 2008 R2 EE for failover clustering.

Let me know if it helped you.
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AmonPereiraCommented:
Yes you can move them.

But it might be a better idea build a CAS 2010 instead of CAS 2007, because you are going to migrate to Exchange 2010.

Pay attention on server installation order, CAS, HUB, MBX and others.

About DAG, it must be installed into Windows 2008 Enterprise Edition and Exchange 2010 EE too, cause failover clustering is needed.

Let me know if it helped you.
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pdixit1977Author Commented:
thanks amon but i have license for 2007 only so i can't migrate my CAS 2007 to 2010. Procurement for mailbox server is still pending so i asked my procurement team to purchase 2010.
Additionally i confirmed from many guys that 2010 standard edition supports DAG however 5 database per server limitation is there which is not a bottleneck for me.

Your thoughts ?
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pdixit1977Author Commented:
Great help, thanks amon
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pdixit1977Author Commented:
one more thing i forgot to ask.

Can we use the mailbox during movement from E2K3 to E2K10 ?
like my mailbox is 1 GB in size and it will take some time to move since 2003 and 2010 servers are placed at different geographical locations so will i be able to use my mailbox during movement.
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