Just in case you missed the big news, Office 2016 for Mac (version is 15.11.2) was released to Office 365 subscribers. If you have a subscription for Office 365 software, you can download Office 2016 from account's download software page. The Public Preview will expire on August 9, as will the RTM installation for non-subscribers; the Enterprise volume licensing and retail perpetual licenses will be released within a few weeks.
Current version (as of August 13 2015) of Office 2016 for Mac is 15.13.1.
You can also propose new meeting times (if using Office 365 Exchange or the new Outlook.com).
Office for Mac looks like Office for Windows, but how similar are they under the hood? Closer than with older versions, but still far apart. Want to request Read receipts? Forget it. Voting buttons? Message Recall? Ok, message recall gets a pass since it doesn’t work all that well on Windows either. Mailtips and other informational messages such as mailbox quota? Nope. VBA? No.
While you can't sync Outlook.com calendar and contacts to Outlook 2016 for Mac right now, after the Outlook.com accounts are moved to Office 365 hosting, you can add the outlook.com account as an Exchange account and everything will sync.
See Compare Outlook 2016 for Mac with Outlook 2013 for Windows for a chart full of comparisons. Yes, there are a lot of No's on the Mac side, but they are making slow but sure progress.
Outlook 2016 for Mac Administrator’s Guide is for system implementers, IT
managers, system administrators, and others who are responsible for planning,
implementing, and maintaining Outlook 2016 for Mac in their organizations.
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