Si sabes que browser es el que no soporta, lo que puedes hacer es detectarlo y si coincide dar un mensaje
Código ASP:
Ver originalDim bc As HttpBrowserCapabilities
Dim s As String = ""
bc = Request.Browser
With bc
s &= "Browser Capabilities" & vbCrLf
s &= "Type = " & .Type & vbCrLf
s &= "Name = " & .Browser & vbCrLf
s &= "Version = " & .Version & vbCrLf
s &= "Major Version = " & .MajorVersion & vbCrLf
s &= "Minor Version = " & .MinorVersion & vbCrLf
s &= "Platform = " & .Platform & vbCrLf
s &= "Is Beta = " & .Beta & vbCrLf
s &= "Is Crawler = " & .Crawler & vbCrLf
s &= "Is AOL = " & .AOL & vbCrLf
s &= "Is Win16 = " & .Win16 & vbCrLf
s &= "Is Win32 = " & .Win32 & vbCrLf
s &= "Supports Frames = " & .Frames & vbCrLf
s &= "Supports Tables = " & .Tables & vbCrLf
s &= "Supports Cookies = " & .Cookies & vbCrLf
s &= "Supports VB Script = " & .VBScript & vbCrLf
s &= "Supports JavaScript = " & .JavaScript & vbCrLf
s &= "Supports Java Applets = " & .JavaApplets & vbCrLf
s &= "Supports ActiveX Controls = " & .ActiveXControls & vbCrLf
End With
TextBox1.Text = s