Exchange 2003 used recovery storage group. I remember Adminstrators used to restore Exchange database to RSG then used Exmerge, which is free tool from Microsoft, to export mailboxes to the existing database, I cannot remember if Exmerge can export individual items other than user mailboxes.
However for companies that have Backup software solutions such as Comvault, they can restore individual items straight from the backup using Comvault without going through RSG.
Exchange 2010 uses Recover database, Nowadays most of the backup solutions have the ability to restore individual mailboxes or individual items straight from the backup instead of going through the method of creating Recover Database then using powershell to restore individual mailboxes.
My question is if a company has a backup solution, then would Exchange 2010 Administrators have to worry about using Recover database?