Hi guys, I have a 2011 MBP running SL so i know that ML will work on my mac. My issue is with my external HDD - when Lion was released, I understand that there was a problem with many external HDD not being able to run on Lion - hence I didn't upgrade. The last thing I want to do is upgrade the OS and find that my time machine backup doesn't work. I've had a look on the iomega website and it says that the HDD works on OS 10.4 - 10.6 or higher, so I'm right in thinking it will work on ML? http://go.iomega.com/en/products/ex...estige-usb-3/?partner=4735#tech_specsItem_tab I've also got a samsung printer, and on the samsung website is says that you need OS 10.3 - 10.6; so I'm guessing that's not going to work with ML. http://www.samsung.com/uk/consumer/print-solutions/print-solutions/mono-printers/ML-3310ND/SEE-spec Finally, will Office 2011 work on ML? I'm a broke student (spent all my money on apple products :/) so I'm trying to get away with not spending any money whilst keeping current on the OS. Should I go for the upgrade and hope for the best? Or is it worth me investing in up-to-date peripherals. I added the links in for you lot to have a look as you're all probably much more technologically advanced than me.