Virtually any kind of information offered to a lawyer may be confidential, including communications concerning past crimes that the client has committed, see Comment to AZ-ER 1.6; Rodriguez v. State, 129 Ariz. 67, 628 P.2d 950 (1981); communications concerning future business decisions such as business acquisitions or purchases of real estate, see In re Spear, 160 Ariz. 545, 774 P.2d 1335 (1989);