GMAil to SmarterMail enterprise email migration

Have ~100 users in corp. GMail account.  Pareto's 80/20 principal applies as usual, where 20% of the users have 80% of storage consumption.  Of course the largest mail boxes are key people and are as full as 15GB's.

Have SmarterTools SmarterMail enterprise v11x (an Exchange clone) and will migrate everyone over to this private server using a different domain address for the new server (not moving the old email domain right away.)

SmarterMail has an import tool for each user.  This looks like a good tool, but several things come to mind.  1) If a user account is as big as 15GB's, then no matter how great the tool is, that's still going to be 15GB's at internet speed and 2) Users have custom folders on GMail; if email migration just grabs and dumps from GMail to one folder in SmarterMail, will have many unhappy campers.

Before we start and find a long miserable migration that we can't stop (in for a penny, in for a pound) is there a way to mitigate these two issues?  Is there an email migration software that can chunk the transfers vs. "all in" of SmarterTools and can it create folders and organize on import?  Prefer a Win software but if Linux, we'll take it...
VirtualKansasAsked:
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The_KirschiConnect With a Mentor Commented:
I admit I do not know SmarterMail but assuming you are using Outlook 2010/2013 you should be able to connect to both mailboxes SmarterMail and GMail with IMAP/POP3 simultaneously and then manually move the mails from one to the other creating custom folders before on the new mail account. Of course that is not really straight forward but it can be done by the users itself and you do not have to move all the mail at once.
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VirtualKansasAuthor Commented:
Dang, that's an innovative approach.  Hadn't thought of it.  Thank you.  I will leave the question open for a brief time to see if i get a response at the server level, but this is a great idea so points to you, for sure...
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VirtualKansasAuthor Commented:
OK; looks like I'll be closing this one out with my thanks.  One thought; how do you feel about using Thunderbird vs. Outlook to do the manual migration as you have described?
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The_KirschiCommented:
I am not sure about Thunderbird but I am pretty sure it can also open multiple mail accounts at once. So it should be no problem.
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VirtualKansasAuthor Commented:
innovative answer and quick response.  Thank you...
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The_KirschiCommented:
I have to thank you. Good luck.
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