We need to migrate from an SBS2008 box to 2008 r2 box running exchange 2010. We also plan on completely getting rid of the sbs box. I feel that I have two options for this. Either I could just build a 2008 r2 server running exchange 2010 and move all mailboxes to it. Then, create a new domain controller and transfer all FSMO roles from the sbs box to the new DC. Then gracefully decommission the sbs box.
The other option is to do an sbs Migration where I create a "tempdc" - take that tempdc offsite, seize all of the FSMO roles - manually remove the old SBS box, and then create my new 2008 r2/exchange 2010 server. Then Forklift the exchange database from the sbs box to my tempdc, clean it up and start moving mailboxes from the tempdc to the final dc. This option pretty much allows me to eliminate Sbs very quickly.
Based on these two options, I think I'd rather go with option one because the most important thing with this client is downtime and a forklift would probably add a good 4 hours considering I'm dealing with a 200gb database.
Any thoughts on the best option?