XADM: Tips for Modifying an Exchange Server Registry Key on MSCS (199756)

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The Exchange Server services must be running before you change a registry key for that service. For example, if you want to change the format of the display name when you run directory synchronization with Lotus cc:Mail, the Exchange Connector for Lotus cc:Mail must be running before you modify the registry on an MSCS.

If you manually update these registry keys while the service is off-line, the changes may not be replicated or may be lost. To prevent this from happening, make any manual changes while the service is online. The ONLY registry that should be modified is the registry of the active node.

MSCS provides registry checkpointing. Registry checkpointing for resources occurs under the following conditions:

• When you specify a new registry key for the resource, the specified key is checkpointed.
• When the resource goes online, the registry keys are updated with the previously checkpointed information.
• When the resource is brought offline, all the checkpoints associated with this resource are saved.
• When the resource is online and changes are made to the registry key which is registered with the cluster server for replication, MSCS ensures that the updates are written to a checkpoint maintained on the quorum device.