# ReOrganize Document library
Use this format to reorganize all folders in a document library. The filename should contain DoclibReOrganize and format is xls(x)/csv. Use this import to split (large) folders into multiple folders based on the DMSMessageDeliveryTime or LastModified. Each document in the folder is moved into a __<year>\<month> folder.
The following columns are required:
Url or MatterCode (/ClientCode)
FileExtension (optional)
If an extension is specified (like msg) only files with the specified extension are moved.