Following warning is seen during the migration:
13:46:58 WARNING: [4996-21-71-80020009] Unable to migrate contents of folder '1D11111C.4Domain.POXXXX.100.1126A6E.1.0C5D.2'"
13:46:58  Exception occurred.
13:46:58 Source: Folders.Object
13:46:58 Description: An invalid argument was passed in the function call.
The folder name is not formatted correctly or this is not a valid folder (possibly a system folder) in the source environment. Most of the warnings are safe ignore because the data will still be migrated.
At the end of the log file you fill see the results of the migration process:
14:09:56 Total mail migrated/filtered: 1607 (148.156MB) moved, 0 filtered
14:09:56 Total appointments/tasks migrated/filtered: 1919 moved, 0 filtered by date
14:09:56 Total attachments filtered: Attachments not filtered by size
14:09:56 Total contacts migrated: 318 moved