Command to set MailBox Quota limits on all the stores in Exchange 2007 environment.
Get-Mailboxdatabase | Set-mailboxdatabase -ProhibitSendReceiveQuota 2GB -ProhibitSendQuota 1GB -IssueWarningQuota 900MB
Command to set Mailbox Quota limits on all the stores on the specific exchange server
Get-Mailboxdatabase -server $Server | Set-mailboxdatabase -ProhibitSendReceiveQuota 2GB -ProhibitSendQuota 1GB -IssueWarningQuota 900MB
Command to set Mailbox Quota limits on all the stores on the specific exchange server except on the specific store
$Server =<ExchagneServername>
$DB =<Databasename>
Get-mailboxdatabase -server $Server | Where {$_.Name -ne $DB} | Set-mailboxdatabase -ProhibitSendReceiveQuota 2GB -ProhibitSendQuota 1GB -IssueWarningQuota 900M
Powershell Command to set Mailbox Quota limits on a specific store in a given Exchagne 2007 server
$Server =<ExchagneServername>
$DB =<Databasename>
Get-mailboxdatabase -server $Server | Where {$_.Name -eq $DB} | Set-mailboxdatabase -ProhibitSendReceiveQuota 2GB -ProhibitSendQuota 1GB -IssueWarningQuota 900M