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Because of programmatic changes in name encoding and decoding, Lotus recommends you upgrade an entire Internet Cluster Manager (ICM) cluster to 5.0.4 at one time. Note that a pre-5.0.4 Domino server will not recognize some name encodings made by R5.0.4 (and later) servers.

If you use the OpenCluster command you should upgrade all of the cluster members, then the ICM server itself.