Syntax Error When Synchronizing *.msg files

Question

I am running SyncToy 2.1, version 2.1.0.0.

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.

Any help would be appreciated.

Thanks.