macOS Sierra Service Notification #2 for Parallels Desktop 10 for Mac usersI am running Parallels V10 with Sierra, no difference with El Capitan, what Parallels said was that V10 would not be supported anymore.
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macOS Sierra SERVICE NOTIFICATION #2 for
Parallels Desktop 10 for Mac users

Apple's latest operating system, macOS Sierra, is now available for download. While Parallels Desktop 10 will run your virtual machines on macOS Sierra, you will not be able to access your Windows files with Mac applications, and a new installation of Parallels Desktop 10 will not work on macOS Sierra. features like Tabs (coming in update 1). You can even monitor and manage your virtual machine disk space usage with the Optimize Storage feature.
BONUS: When you upgrade to Parallels Desktop 12 you also get Parallels Toolbox for Mac and 500 GB of online backup storage, powered by Acronis, for 1 year, a $49.99 value.
Upgrade to Parallels Desktop 12 for Mac