September 29th saw Microsoft release a new hotfix rollup package (build 4.0.3714.2) for Forefront Identity Manager (FIM) 2010. The official documentation for this build can be found on the Microsoft support website under knowledgebase (KB) article kb2887498. Download link is here. This build supersedes 4.0.3684.2.
The hotfix contains two (2) updates for FIM Synchronization. Full details of each update, duplicated from the KB for posterity, follow. Hit the KB for the known issues and other details.
FIM Synchronization Service
FIM synchronization cannot deprovision computer objects in Active Directory when there are other child objects, such as printers and file share objects, present on the computer object.
An export-only ECMA1 Management Agent might give the error “There is no primary object class on this image” during export of an object delete operation.