Recently when troubleshooting some Maintenance Window issues for SCCM 2012 clients, I was watching the client log ServiceWindowManager.log
Each Maintenance Window has a type. For example I set a Maintenance Window for All Deployments.
You can see that this had Type=1.
If you are curious to see what other maintenance windows you may have set for the client, you can check out this link or look at the table below.
|Value||Service Window Type||Description|
|1||ALLPROGRAM_SERVICEWINDOW||All Programs Service Window|
|2||PROGRAM_SERVICEWINDOW||Program Service Window|
|3||REBOOTREQUIRED_SERVICEWINDOW||Reboot Required Service Window|
|4||SOFTWAREUPDATE_SERVICEWINDOW||Software Update Service Window|
|5||OSD_SERVICEWINDOW||OSD Service Window|
|6||USER_DEFINED_SERVICE_WINDOW||Corresponds to non-working hours.|