If you have bulk data files in the EML format and you want to export the files to MSG format then you can simply opt the best solution i.e. ZOOK EML to MSG Converter. It has been designed with an intuitive GUI interface for both technical and novice users. It preserves all the email properties and data integrity of the files intact even after the conversion process. It is an independent solution that does not require the installation of any external utility to export the files format. 

Features of EML to MSG Outlook Converter:-

1. Supportable with multiple EML based email clients and MS Outlook editions.

2. Capable enough to maintain the original folder hierarchy.

3. Preserves all the metadata and RTF formatting of the files. 

4. Offers the users to export the files in the batch at once.

5. Ensures no data alteration throughout the conversion process.

Read more details at:-   Windows Live Mail to MSG Converter