Function AllowNewRecord() As Boolean
Dim rsCheck As ADODB.Recordset
Set rsCheck = New ADODB.Recordset
rsCheck.Open "SELECT * FROM YourTableNameHere;",CurrentProject.Connection, adOpenKeyset, adLockReadOnly
rsCheck.MoveLast
rsCheck.MoveFirst
Select Case rxCheck.RecordCount
Case < 100
AllowNewRecord = True
Case Else
AllowNewRecord = False
End Select
rsCheck.Close
Set rsCheck = Nothing
End Function