SBS 2008 Staged Migration to 365

Hi,

We plan to migrate from SBS 2008 (Exchange 2007) to Exchange Online

We will deploy a new VM (2012 R2) for the DirSync installation

After the Exchange Online MIgration is completed. We plan to install a new windows 2012 R2 Domain Controller and move all the shared folder and stuff left on the SBS Server and after decommission the SBS Server.

In between the Exchange Online migration and the Decommission the SBS Server we will have couples of week in between (holidays)

My two questions :

When I will deploy the DirSync do I need to upgrade the Forest / Domain Level to a level higher then the SBS 2008 will support ?
 
After the Exchange migration is done and I turn off all the services of Exchange 2007. Does SBS will "panic" if the Exchange Server is Off, All the services disabled ?  ** Sometimes SBS doesn't react as a normal infrastructure. **

If anyone had done this type of migration please share.
JF SAsked:
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Vasil Michev (MVP)Commented:
You  dont need any FFL/DFL changes in order to run dirsync/AADConnect. As for disabling the Exchange server, bear in mind that the only supported way to manage Exchange related attributes for dirsynced accounts is via the Exchange tools. So it's recommended to leave at least one Exchange box for management purposes. More info here: https://technet.microsoft.com/en-us/library/dn931280(v=exchg.150).aspx?f=255&MSPPError=-2147217396
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Frank JacquesCommented:
question #1 , i think not, although check the requirements for dirsync as 2008 is a bit old.
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