When synchronizing folders that contain Outlook messages saves as *.msg files, I recieve the message "Error: Cannot write to the destination file. The filename, directory name, or volume label syntax is incorrect (Exception from HRESULT: 0x8007007B)..."
If I modify the synchronization settings to exclude *.msg files, the synchronization runs without errors.
I have browsed this SyncToy support forum and haven't found any posts that relate to this error.
I know it's a long shot but I had this error message when trying to write files from a local drive to a mapped SharePoint location. The problem came down to the name I'd used when I mapped the SharePoint library. I'd mapped it as something like this:
Z: --> \\intranet\myteams\erp\Shared%20Documents
and kept hitting this issue. However, when I mapped it like this: