MessageOps Dynamic Groups allows you to replicate some of the same functionality that Dynamic Distribution Lists provide in on premise Exchange environments or Office 365 where the groups are managed in Office 365.
MessageOps Dynamic Groups allows you to populate group membership based on an LDAP filter, and schedule when the group should be updated. These changes are then replicated to Microsoft Online via the Microsoft Online Directory Sync.
To use the application you simply have to configure which group to run against, what time you want it to update, and the LDAP filter that will determine which users are put in the group.
You also have the ability to preview the group to see what users will be added or removed based on the filter.
Once the rule is created, it will run at the scheduled sync time each day, or you can manually force an immediate synchronization.
MessageOps Dynamic Groups is free for all organizations to download and use. Registration is required.