1. Remove the Mailbox database copy:
1.2 In the EAC, go to Servers > Databases.
1.2 Select the mailbox database whose copy you want to remove.
1.3 In the Details pane, locate the passive copy you want to remove and click Remove.
1.4 Confirm the removal on the warning dialog box by clicking yes.
1.5 Click ok to confirm the removal after reviewing any messages.
1.6 After all copies are removed, preserve the database and transaction log files from each server from which the database copy is being removed by moving them to another location. These files are being preserved so the database copies don't require re-seeding after they have been re-added.
2. Move the mailbox database path to the new location.
2.1 In the console tree, navigate to Organization Configuration > Mailbox.
2.2 In the result pane, on the Database Management tab, select the database you want to configure.
2.3 In the work pane, click Move Database Path
2.4 In the Move Database Path wizard, under Database paths, click Move to move the database path to the default location. You can change the location for the database file path by editing the Database file path field. You can change the location for the log folder path by editing the Log folder path text field.
2.5 View the status of the move operation. The wizard moves the database file path and the log folder path to the new location. Click Back to make configuration changes.
2.6 On the Completion page, confirm whether the move process completed successfully. A status of Completed indicates that the wizard completed the task successfully. A status of Failed indicates that the task wasn't completed. If the task fails, review the summary for an explanation, and then click Back to make any configuration changes.
2.7 Click Finish to complete the Move Database Path wizard.
2.8 Create the necessary folder structure on each Mailbox server that previously contained a passive copy of the moved mailbox database. For example, if you moved the database to C:\mountpoints\DB1, you must create this same path on each Mailbox server that will host a mailbox database copy.
2.9 After creating the folder structure, move the passive copy of the mailbox database and its log stream to the new location. These are the files that were left from and preserved after Step 3. Repeat this process for each database copy that was removed in Step 1-6.
Othman Benkirane from NEPA PFE team.