The best way to undo the changes made by SME in order to:
move the databases and the log files back to the local disk is to use the Configuration Wizard. The SME Configuration wizard enables you to move your Exchange data from local disk to LUN, or LUN to LUN, or LUN to local disk.
remove all SME jobs is to use the Scheduled Jobs in the Scope pane. When you select Scheduled Jobs, the details of all scheduled jobs such as backup and integrity verification jobs are displayed in the Results pane. You can view, edit, and delete these jobs.
remove LUNs from Windows is to use SDW to disconnect the disks.
remove LUNs from Filer when all is done is to use the system manager or putty. This can also be done by deleting the disk (without using the disconnect disk option) from SDW.