It is a known issue that Outlook 2016 cannot connect to Exchange 2007. Also you can experience issue wint app LEAP. Here are the steps to switch back to Office 2013 as a temporary workaround:

1. Use the Fix it tool to remove the current Office 2016. See: Uninstall Office 2013, Office 2016, or Office 365 from a Windows computer

2. Install Office 2013 via the URLs below:

For Office 365 Business or Office 365 Business Premium: 32-bit, English:

64-bit, English:

For Office 365 Enterprise E3 or Office 365 ProPlus:

32-bit, English:  

64-bit, English:

**Important: After you have rolled back to Office 2013, make sure you read this article to prevent Office 365 ProPlus/Office 365 Business from automatically updating to Office 2016 directly from the internet. "Method 2" in the article may applies to you.

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