Exchange 2007 Event
Source MSEchangeIS Mailbox Store
ID: 9871

This is an online maintenance overlap for database “first storage group\Mailbox Database”. Please revise the online maintenance schedule.
Correct this:  Open Exchange Management Console and expand Server Configuration.  “My client has two exchange servers, splitting up the roles.  The server with this issue is the Mailbox store”.  In Server Configuration, click on Mailbox on the left hand side.  Click on your mailbox server name and in the reading pane below, expand First storage group to show Mailbox Database.  Right click the mailbox store and select properties.  On the general tab, click the Maintenance schedule drop down and select a new interval, or click customize to create a custom schedule.  I changed mine from 2:00 AM to 6:00 AM to 1:00 AM to 5:00 AM.  I will post back tomorrow to see if that fixed the error message.

Problem Solved!