Before upgrading, please check your system's software and peripherals - printers, scanners, cameras, custom keyboards, etc., to make certain they are compatible with Sierra. Go online and check the manufacturer's website or call them directly.
If you do upgrade, there is NO DOWNGRADE OPTION. The only solution is to have ITCS re-image the computer.
These software programs are not currently compatible with Sierra. You may need to purchase upgrades:
No. Some products are just not compatible with other items that we support.
Apple has excellent phone support: http://www.apple.com/support