Issue: I want to remove the old “Offline Address Book” (MBXMAIL1 R:\SG_MP01\OAB\ExchangeOAB)old SAN. I want a New “Offline Address Book” (MBXMAIL1 N:\SG_MP21\OAB\ExchangeOAB)New SAN. What I did: I removed the old Offline Address Book from MBXMAIL1. Exchange Management Console Organization Configuration Mailbox Offline Address Book Tab (right click on) Default Offline Address Book (MBXMAIL1) | MBXmail1 | True | Public Folder, Web Based (remove) Default Offline Address Book (MBXMAIL1) is gone from the Exchange Management Console, But Open Explorer on MBXMAILA Old SAN Disk on MBXMAIL1 MBXMAILA_FMP R:\SG_MP01\OAB\ExchangeOAB The old “\OAB\ExchangeOAB” share folder is still there alone with all the .lzx files. How do I remove this? Can I just delete it? Note: I have created a New OAB on another node in the cluster and pointed all the mailbox databases to the new OAB. This one has been online for three weeks and is working as advertised. Thank youSupreme Commander of the Asgard Fleet.

Well I used some of my Microsoft Support time but I go the answer to my question. The sad part is, when I created the Second Offline Address Book on the XMBMail3, that process gave me the answer and I didn’t make a note of it. The Key was, no pun intended, a registry key change. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeSA\Parameters\{ClusterMailboxServerName}\OabDropFolderLocation So, from where I left off, after removing the OAB from the Exchange Management Console: On XMBMail1 Change the \OabDropFolderLocation in the Key above From “Old SAN Path”- R:\SG_MP01\OAB to “New SAN Path” - N:\SG_MP21\OAB. In explorer, select the “ExchangeOAB” on R:\SG_MP01\OAB\ “Properties” “Sharing” Tab click Do not share this folder. Rename the \OAB\ExchangeOAB\{random numbers the mean something to Microsoft}\ folders to something easy to type, for me, Delete0, then delete the files inside the folder \{random numbers the mean something to Microsoft}\. Open cmd.exe change directory to the folders, now renamed Delete0, and start RD - (remove directory) through the path until there all gone. The old OAB is now gone. Now I had one OAB on XMBMail3, all databases pointing to it and the old SAN disk are clean and free to remove from the cluster. I did continue on and create a second OAB on XMBMail1. Using the Exchange Management Console, with the registry change I made above, it placed a new “ExchangeOAB” folder in the new OAB folder I created manually on the new SAN. FYI: When you create a new OAB you will need to restart the Microsoft Exchange System Attendant service. Supreme Commander of the Asgard Fleet.