Migration from Server 2003 (Enterprise) to SBS 2008

I will be doing a migration from Server 2003 to SBS 2008 and I am planning to use the Migration wizard to migrate the data and mailboxes across. Has anyone done this successfully before - if so how?

Bearing in mind there is 500gb of data/mailboxes to migrate approx how long should the transfer take?
Also how are shared folders migrated and then redeployed without losing consistency whilst client computers are potentially saving data?
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itcroydonAsked:
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itcroydonAuthor Commented:
P.S. I have already seen the other experts exchange article on this: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_24972625.html?sfQueryTermInfo=1+2003+2008+enterpris+from+migrat+sb+server 

and the three other posts on IT knowledge exchange
http://itknowledgeexchange.techtarget.com/sbs/standard-server-2003-migration-to-sbs-2008-part-1/

I am also aware of the Microsoft whitepaper on Migration from SBS 2003-2008
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uescompCommented:
To be honest it depends on how many users, and how many of those users are currently in their folder or using email.  This will severly slow down the migration progress for it will constantly be waiting to access files in use or wait for the mailbox to be closed and in some cases skip the user.  one thing i made a mistake on is not turning off folder redirection before the transfer, folders will keep the mapping to the old server and it was a pain to reset the folder redirection to the new server.  Other than that here is an article to brush up on when doing the migration.

http://technet.microsoft.com/en-us/library/sbs-2008-2003-migration%28WS.10%29.aspx

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Glen KnightCommented:
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itcroydonAuthor Commented:
There are approx 30 users in total who could potentially be using e-mail during the migration
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uescompCommented:
Those users will extend the migration time, as i stated before we had 72 users and although they were informed not to use email or access their data files, users were still accessing files and leaving outlook open.  In which case we spent more time finding the pc to close everything out.  

And demazter that is an excellent article, i mean that is seriously awsome and details.  Nice work.
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Glen KnightCommented:
Make sure you vote for it :)
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