While checking my Exchange 2010 sp2 server, I found that the configuration version and the unpack version for Mailbox role is different. Then I follow the instruction to delete the current Discovery Search Mailbox from the Exchange 2010 EMC and from the Active Directory. From the Exchg server, I also removed the "action" and "watermark" registry keys from
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v14\MailboxRole
Then I started to run setup.exe /preparead...but I do not see the Discovery Search Mailbox recreated after.
So, I ran the SP2 setup again on Exchange 2010 to find out if it will be created back but still do not see it.
I found some kb to recreate systemmailbox including "systemmailbox", "federatedemail", these two boxes or ad account still in AD, do I need to delete them first?