I purchased a new MBP 15.4 in 3/2017. I have MSO for MAC Home & Student 2011 installed software. I upgraded my OS in 11/2017 from MACOSSierra 10.12.6 to MACOS High Sierra 10.13.1. My excel workbooks stopped working--i.e., not compatible. I downgraded my OS back down to MACOSSierra 10.12.6 so I could continue to use my excel financial worksheets. MS claims that Office 365 Personal works on high sierra but if you look at their website there are many unhappy folks with many problems including software incompatibility with MSO 365 and the stand along MSO 2016. I am only interested in word and excel. I know that you must have the latest version of Office to work on high sierra. I would love to upgrade to high sierra but not until I'm confident that my word and excel will work with it. My financial life is on excel. I am most interested in the PAST SPECIAL feature in Excel where you can paste link, or just paste formulas, or values, etc. Lastly, I would prefer the stand along MSO 2016 but you only get one year of upgrades and patches and support. My question is what experience have you all had? I trust this site more than mso site. Thanks in advance & HAPPY NEW YEAR!