In order to work around my backup windows, I have scheduled online maintenance to occur from 3am to 8am Mon-Sat, and from 6am to 11am on Sunday. The trouble is, that although the public store seems to respect this setting, the private store seems to begin at precisely 6am every day, and end at 11 (generally, the second defrag pass on the private store is interrupted at 11, so I know it is not respecting the setting, else it should get interrupted at 8, right?). In an attempt to resolve this, I changed the online maintenance setting for the private (mailbox) store to run at the same time all week - 3-8am. Still no joy. Do I need to restrat the services to pick up the setting, what gives here? FYI - Windows 2003 SP1, Exchan ge 2003 Ent.. Information Store is about 13GB. TIA

By default defragmentation can run up to an hour after your maintenance window expires... You might want to check the keys below to see if you have non-defaults set. http://support.microsoft.com/kb/324358 Online defragmentation If at least one subtask completed successfully and performed work that resulted in a database change, online defragmentation runs after information store maintenance is complete.By default, online defragmentation runs for a minimum of 15 minutes and a maximum of 1 hour after the information store maintenance period.To override the minimum time for Online Defragmentation, use the OLD Minimum RunTime registry value. (0 for no overrun, and the default is one hour: 1*60*60 seconds). To override the length of time that online defragmentation can run beyond maintenance, use the OLD Completion Time registry value. (the default is fifteen minutes: 15*60 seconds)If the maintenance schedule style is not "Always," then a check is performed to see how long online defragmentation can run. The amount of time left in the maintenance window is determined and added to the OLD Completion Time value (by default, 1 hour). This accounts for situations where the last subtask runs a little longer than the configured maintenance schedule. If the calculated value is less than the OLD Minimum RunTime value, the calculated value is set to OLD Minimum RunTime. After online defragmentation is complete, a store routine calculates the number of free megabytes left in the database and logs the following event ID message: Event ID: 1221 - The database name has amount megabytes of free space after online defragmentation has terminated.