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Hi ​@KSai, 

Welcome to Box Community, and we’ll help regarding invitations. 

If it’s just the folder owner’s email that is inactive and his/her Box account remains active, you just send the invite. 

 To invite someone to collaborate in a file or folder:

1. Open the Share window. To do this, in your Box files view, hover over the row of the file or folder you wish to share.
2. On the right, click Share.
   
    
3. The Share window opens.
   
4. In the Share window, under Invite People, click Add names or email addresses.
5. Type a collaborator's name or email address.
   • As you type, Box anticipates your intended recipient and lists corresponding email addresses.  You can select the recipient you want, or continue typing the full email address.
   • When typing full email addresses, separate recipients by a horizontal space.
6. Click the Invite as drop-down menu. Box displays a list of roles.
7. Click the role you wish to assign to the collaborator.
8. (Optional) In the Message field, type a message of up to 750 characters for the collaborator.
9. Click Send.

However, if it’s the Box account that’s inactive it’d be impossible to access the folder and invite a collaborator. 

Hope it helps, and please let us know if you have questions.