So far, Office365 is rock solid and quite powerful. For my Apple/Mac friends out there, I’m running all Office365 apps on Win8 using Parallels 8 Coherence. Experience is entirely seamless to the point where I’ll likely uninstall the native Office suite (which is WAY behind the windows 2013 apps feature-wise and in terms of ease of use). Speed/CPU is not an issue with my iCore7/SSD MBP setup. Only thing that’s becoming a problem is the 500Gb SSD filling up fast with this type of multiple OS configuration.
