Regarding reply back to same email which has attachment

@Elluru You can do this via the below steps,

1 Read the mail one by one using “Get Outlook Mail Messages” activity
2 Use the Foreach activity,
3 Download the file “Save Email Attachments” and process the Excel activity and create a new file
4 Now you can use the “Reply To Outlook Mail Message” for the replay to mail.
4.1 In item collation you pass the path of save file

@Elluru Hope its sove your issue