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If you are using clusters that contain some Domino R5 servers and some Domino R4.x servers, keep the following in mind when you set up mail databases:

• The R5 mail template does not work properly on R4.x servers. If a user has a R5 mail database, do not create a replica on a R4.x server.
• Because the cluster replicator always replicates the template design between replicas, the user's mail replicas should use only the R5 mail template or only the R4.x mail template.

• Documents that you receive in MIME are converted to Notes CD records on R4.x servers, so they look different than on R5 servers. R5 servers display these documents in native MIME.
• Documents that you send in MIME are converted to CD records when you send them from R4.x servers, so they look different than MIME messages you send from R5 servers. In addition, the original MIME version is attached to the message on a R4.x server. This is not necessary on a R5 server because the message is sent in native MIME.
• Encrypted S/MIME documents can be decrypted by R5 servers but not by R4.x servers. When an R4.x server receives such a document, whether because of cluster failover or replication, the content of the document is replaced a warning stating that the document was encrypted with an Internet certificate and cannot be read.