googln is nicht so deine stärke?
Set-MailboxDatabase -Identity "Server1\MailboxDatabase1" -IssueWarningQuota 209715200 -ProhibitSendQuota 262144000 -ProhibitSendReceiveQuota 293601280 -QuotaNotificationSchedule "Sun.2:00-Sun.3:00","Wed.2:00-Wed.3:00"
oder
Start the Exchange Management Console.
In the console tree, expand Server Configuration, and then click Mailbox.
In the result pane, select the server that contains the mailbox database for which you want to configure storage quotas.
In the work pane, select the mailbox database for which you want to configure storage quotas.
In the action pane, under the name of the mailbox database, click Properties.
In <Mailbox Database Name> Properties, click the Limits tab.
On the Limits tab, under Storage limits, complete the following fields: