By default, Outlook 2016/365 are limited to 50GB PST/OST files. To set the limit to 100GB, do either of these:
Run from a run box or a command prompt:
reg add "HKCU\Software\Microsoft\Office\16.0\Outlook\PST" /v MaxLargeFileSize /t REG_DWORD /d 102400 /f
Open the registry editor. Go to this key (make it if it does not exist):
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\PST
Make a new DWORD (32-bit) value, call it MaxLargeFileSize. Change it's value to decimal then type in 102400 and press OK.
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