[There's a reason that Yoda is the unofficial mascot of SBS.  Size indeed matters not.] Forefront tweaks for SBS 2008 migration - THE OFFICIAL BLOG OF THE SBS DIVA
Wed, Oct 1 2008 10:13 bradley

Forefront tweaks for SBS 2008 migration

When you migrate to a SBS 2008 turn OFF the realtime engine during migration.

Otherwise as you migrate across your email will get spam filtered during the migration

Also when you have 4 engines in Forefront running each engine takes processes as you can see below:

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