You say that your source is interpreted as "áâãäåæçéêëìíîïðñóôõöù".
Note that the Visual Basic Editor doesn't display Unicode, but it does support manipulating Unicode strings:
Dim strValue As String
strValue = Range("A1").Value
Range("B1").Value = Mid(strValue, 3)
Range("C1").Value = StrReverse(strValue)
If A1 contains Greek characters, B1 and C1 will contain Greek characters too after running this code.
You just can't view the values properly in the Immediate window, or in a MsgBox.