/mcpIf you do not complete all of these steps in the order shown, recovery of the IM and Presence Service database publisher node will fail. Note 1. Power down all the IM and Presence Service subscriber nodes. 2. Delete the subscriber nodes as follows: a. Unassign all users that are assigned to each of the IM and Presence Service subscriber nodes. (Select Cisco Unified CM Administration > User Management > Assign Presence Users). b. Remove the subscriber nodes from their presence redundancy groups. (Select Cisco Unified CM Administration > System > Presence Redundancy Groups). c. Delete the subscriber nodes from the Unified Communications Manager server list. (Select Cisco Unified CM Administration > System > Server). 3. Power down the IM and Presence Service database publisher node. 4. Delete the IM and Presence Service database publisher node as follows: a. Unassign the users that are assigned to the IM and Presence Service database publisher node. (Select Cisco Unified CM Administration > User Management > Assign Presence Users). b. Remove the node from the presence redundancy group. (Select Cisco Unified CM Administration > System > Presence Redundancy Groups). c. Delete the IM and Presence Service database publisher node from the Unified Communications Manager server list. (Select Cisco Unified CM Administration > System > Server). 5. Readd the IM and Presence Service database publisher node to the Unified Communications Manager server list. 6. Perform a fresh install of the IM and Presence Service database publisher node. 7. Readd the IM and Presence Service subscriber nodes to the Unified Communications Manager server list. 8. Perform a fresh install of each subscriber node. IM and Presence Service Subscriber Node Complete the following high-level procedure to reinstall an IM and Presence Service subscriber node. If you do not complete all of these steps in the order shown, recovery of the IM and Presence Service subscriber node will fail. Note 1. Power down the IM and Presence Service node. 2. Delete the subscriber node as follows: a. Unassign the users that are assigned to the node. (Select Cisco Unified CM Administration > User Management > Assign Presence Users). Installation Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs 97 Troubleshooting Unrecoverable IM and Presence Service Node