Is there any way to generate unique ID (in SQL Server newid ()) in Excel 2007

you can use CoCreateGuid

Declare Function CoCreateGuid Lib "ole32" (ByRef GUID As Byte) As Long

Public Function CreateGUID()
   Dim ID(0 To 15) As Byte
   Dim N As Long
   Dim GUID As String
   Dim Res As Long
   Res = CoCreateGuid(ID(0))
   For N = 0 To 15
      GUID = GUID & IIf(ID(N) < 16, "0", "") & Hex$(ID(N))
   Next N
   CreateGUID = GUID
End Function