Exchange 2010 - Create a new Mailbox Database

Hello all and thanks in advance for your time and expertise.
Here's my scenario:
In my ORG we have one exchange server.  The hard drive space on this server was quite low so we added two more drives which are independent and in their own Raid Configuration from the drives that were already installed.  In other words, the current
mailbox database is housed on drives with a total storage capacity of 837GB. 
We recently added two more drives, each 2TB, and configured them in a RAID1. 
I'm going to create a new Mailbox Database on the 2TB drives and move over some mailboxes to balance out the storage. 
Question one:  When we move some of the mailboxes over to the new database - will this free up space on the existing database or do we have to reclaim it such as with an offline degrag.
Question two:  When I create the new mailbox database and I'm prompted to Enter the new file locations for the database (database path and log folder path) - do I just change the paths to the new drive letter path such as G:
We're eventually going to Office365 (hopefully sooner rather than later) but I just want to make sure I handle this process correctly. Your input here is greatly appreciated.

Hello,
Your databse size is 650 GB.  As per my experience , it would not take more than 14 hours for total mailbox movement.
You will be creating new database of 2 TB , you have already allocated 2 Tb drive to exchange server.
If you are dividing drive into 2 or four part and creating that much databse, it will be helpful for maintence activity in future.
It is recommended that you move mailbox during off bussiness hours, it will fasten the movment,as there will be no load on exchange server . You can do it on daily basis Or you can do it on weekend .
You need to take care of logs generated during movment, are you going to  use seperate log drive for databse, or combine with database drive. If you are moving all mailbox to one database, It will genrate same size of logs file as of total mailboxes
size (650 GB). You neeed to handle it properly. Enable circular logging on database, after movment ,you can disable it.
Moreover, if you will create move request of all mailboxes, exchange will process nly 50 request, rest will be in queue state.
Regarding public folders, I understand there is no seperate disk for public folders, if you planning to delete old dtabse and free up disk space, you will have to move this public folders database to new disk also.
Would recommend that you take advice  from other expert in this forum, before implementation.

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