Office Professional 2010 OR Office Professional 2016

Hi,

I currently use OFFICE Professional 2010. I have SCRIPTS and a third party software that create Excel files.
ACCESS modules LOAD these excel files into an ACCESS database.
ACCESS then creates reports based on the data loaded. These reports are sent to users that have Office professional 2010.

I want to buy a new Office suite for a Windows Server 2012 R12
I am trying to decide whether to purchase Office Professional 2010 OR Office Professional 2016.
Note: Everyone right now has Office Professional 2010

Questions:
1) Is it safe to install OFFICE Professional 2016? or is it better to stay with 2010?
2) Users that already have Office Pro 2010 would be able to read files created by Office Pro 2016? (whether in Excel or ACCESS)
3) VBA code in EXCEL and ACCESS would still work without issues?
4) The number of rows in Office 2016 is still the same as in 2010...(above 1,000,000)? and ACCESS size limitations are still the same?

Thanks in advance for your comments!