Best way to implement Exchange 2007 server.


I am working with a company who currently runs a Microsoft AD 2003 environment.  Currently they have roughly 200 users that are hosted on an off-site POP3/SMTP email server.  I have got the owners to bite on switching to Exchange server.  Since I haven't really don't a migration with exchange before of this size, I need a little planning help.

What I am trying to figure out is what is the best way to move all the PST files which are stored on all the client desktop/laptop PCs onto the user's newly created exchange box.  Also, what is the best way to migrate the system.  It appears this would have to be a process that is done overtime vs. a overnight thing since out of the 200 users 150 are laptops which roam throughout and aren't always in the office.
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Rajith EnchiparambilConnect With a Mentor Office 365 & Exchange ArchitectCommented:
Microsoft has released a new version of the Microsoft Transport tool and this new release has new capabilities such as migrating from POP3 and IMAP4 servers to Exchange Server 2007.

Process is fully documented here

mm1250Author Commented:
Ok thanks, I did have another question.  They have 2 Locations.  Both being on the same AD domain linked via a Sonnicwall Site-to-site VPN. The bracnh office carries around 30-40users or so.  

Does it make sense to install a 2nd exchange server in the branch or just leave 1 box at the main office?  Thing I'm thinking about is mailbox datatransfer between the sites. How much bandwidth can I save by installing 2 vs. just one?
Lot of bandwidth can be saved
I would suggest a new server
so incase one branch goes down another is not affected
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