Restoring From Backup
http://www.msexchange.org/tutorials/Working-Recovery-Storage-Groups-Exchange-2007.html
http://technet.microsoft.com/en-us/library/aa996770(EXCHG.65).aspx
http://ben.goodacre.name/tech/Restore_using_NTBACKUP_(Exchange)
http://www.wbadmin.info/articles/howto-exchange-2007-restore.html
http://www.petri.co.il/using_rsg_in_exchange_2007.htm
Repairing Database:
http://technet.microsoft.com/en-us/library/aa998249(EXCHG.80).aspx