Hi 
@SakshiShivhare,
You can try below code to rename Email's Subject -
-  Input Parameter - 1. Entry ID (Text) 2. Subject (Text)
 
- Output Parameter - 1. Success (Flag)
 

Code Stage  - 
-  Inputs - 

 
- Outputs - 

 
-  Code - 
 
Dim app = CreateObject("Outlook.Application")
Dim _nameSpace As Microsoft.Office.Interop.Outlook.NameSpace = app.GetNameSpace("MAPI")
Dim item = _nameSpace.GetItemFromID(Entry_ID)
'Below line of code will update the subject line'
item.Subject = Subject
'Below Code will save the updated subject' 
item.Save
'Below code will verify the updated subject'
If item.Subject = Subject
Success = True
Else
Success = False
End If
------------------------------
KirtiMaan Talwar
Consultant
Deloitte
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	KirtiMaan Talwar
IA Consultant
Deloitte USI
#MVP