Outlook 2016 error messages help please.

That means your mailbox is still being hosted on an Exchange 2007 server. When you use Outlook 2016 with an Exchange account, your mailbox must be hosted on Exchange 2010 or later.

As the error stated; Contact your e-mail administrator and ask about the possibilities to get your mailbox hosted on Exchange 2010 or later.

You are absolutely correct nosmada54.

I do not understand why Microsoft would not have a grandfathered window of time say 6 month to a year before deactivating Exchange 2007 sync function.

They ask for users to help prove out the office 2016 software in the insider programs with windows 10, then make it a pain in the A** to revert back to previous builds when they deactivate it without notice.

Contrary to the belief of the VIP members who keep saying in these forms that everyone knows that Microsoft only supports 3 versions of exchange, I do not believe this to be the case.

Further, not all companies are in a position to update their copy of exchange as quickly as Microsoft would like. I have no problem with a phase out date but tell the users before they engage in these insider programs to help build better products what it is.

It users like us that convince our companies that upgrading to the newer office suites is the way to go. That's where the money is. 

In the end, Microsoft is doing a disservice to their users and themselves by this kind of policy.

Finally, its not like it can't work from a programing perspective because we have already been using it. My two cents.

Cheers.