I read the following on a Microsoft support page. Is this behavior the same when using the group policy to set the updatetargetversion? I just wanted to make sure the schedule randomizing still occurs when the version is specified which will be the last months version. We are using the default path http://officecdn.microsoft.com/
When the latest update is available, Office will schedule a time randomly over the next few days to download and install the update. When the update triggers, the client performs a delta comparison to determine which pieces have changed and then only retrieves the pieces that have been updated to reduce network traffic. The random scheduling is also done so not all users are downloading from the web at the same time. To enable this type of updates management, in the Configuration.xml file used for install, set the enable updates to true but do not add a specified path. This will default the path to the Office 365 service http://officecdn.microsoft.com/