Upgrading from 5.0.4 to 6.0.3 - forwarder compatibility

[lmcmahon]

Do all my Universal Forwarders need to be upgraded, or is it backward compatible?

[ChrisG]

You do not have to upgrade your forwarders. Forwarders from version 4.2 can send data to 6.0.x indexers. See Compatibility between forwarders and indexers in the Forwarding Data manual.