Sub mail_merge()

On Error Resume Next

Dim xStrFile As String
Dim xFilePath As String
Dim xFileDlg As FileDialog
Dim xFileDlgItem As Variant
Dim xOutApp As Outlook.Application
Dim xMailOut As Outlook.MailItem
Application.ScreenUpdating = False
Dim data_file As Workbook

'Set WB_Data_file = Workbooks.Open(ThisWorkbook.Sheets("sheet1").Range("h11").Value)
'WB_Data_file.Activate
'WB_Data_file.Sheets("sheet1").Activate
lastrow = ActiveWorkbook.Sheets("Data ").Range("a" & Rows.Count).End(xlUp).Row
'username1 = Environ.UserName
For i = 2 To lastrow

'******please change your files path here***********************
'C:\Users\BodapatiSarada\Desktop\Maxi project2\checking files
Path = "C:\Users\000H6P744\Desktop\Test project\" & ActiveWorkbook.Sheets("Data ").Range("E" & i).Value & ".xlsx" ' we need to change path
Set xOutApp = CreateObject("Outlook.Application")
Set xMailOut = xOutApp.CreateItem(olMailItem)
'If xFileDlg.Show = -1 Then
With xMailOut
.BodyFormat = olFormatRichText
.To = ActiveWorkbook.Sheets("Data ").Cells(i, 1).Value
.CC = ActiveWorkbook.Sheets("Data ").Cells(i, 2).Value
.Subject = ActiveWorkbook.Sheets("Data ").Cells(i, 3).Value
.body = ActiveWorkbook.Sheets("Data ").Cells(i, 4).Value
.Display
.Attachments.Add Path
.Display
.Send

Application.Wait (Now() + TimeValue("0:00:01"))
End With
ActiveWorkbook.Sheets("Data ").Cells(i, 6).Value = "completed"

Next

Application.Wait (Now() + TimeValue("0:00:01"))

Set xMailOut = Nothing
Set xOutApp = Nothing
Application.ScreenUpdating = True

MsgBox "Completed"

End Sub