In the NM setting document under the other options tab there is a choice to change the name of the Unfiled folder to one of your own choosing.
This will update all the migration profiles in the NM database and will place unfiled document into this folder name.
In 19.09 this change is not taking affect. When look at the smaller log we can see that the name is set.
17:54:13 CMTMigrateUnfiled (All Documents View) option Found, value: 1
17:54:13 CMTUnfiledDestination option Found, value: alldocuments
In build 19.09 we added a xml file to resolve a problem with non-English language folders.
On each worker we add a file NMFolderNames.xml. This file had the system folder name for English and French in it. Note Migrator listens to what value is in the file regardless of what the setting says.
The workaround is to replace the values in bold below with "alldocuments" or whatever value you want and save the file to get the desired result. This file need to changed on all of the workers or one copy can be change the then distributed to all the workers. The file is located on every worker in C:\Program Files (x86)\Binary Tree\CMT for Exchange\Worker. The file can be edited in notepad and then save.
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This limitation has been reported to development.