I am still using MS office 2007, it is fully updated
I know several alternatives, but I am familiar with Office 2007, just hesitate to change.
I fully understand your desire to stick with Office 2007. I migrated from Office 2003 to 2007 when 2007 came out, then used 2007 daily (Outlook controls my life) for over 10 years. But security does trump all so I eventually gave in and upgraded to Office Home and Business 2016.
I went with the "and Business" version because it includes Outlook - and like I said, Outlook controls my life. Beyond that, Word, Excel and the other programs in the suite are identical to the standard Home editions of Office. I also decided to buy the stand-alone version instead of Office 365. The big advantage to Office 365 is it always remains current and that is really nice. But it is based on an annual subscription fee and that to me makes it just another bill. I don't like bills.
The 2016 versions of the programs definitely look different from the 2007 versions but in reality, they are much more similar than different - especially in their functions. A word processor is a word processor, and a spreadsheet program is a spreadsheet program, after all. There is a learning curve but the reality is, most of it is very intuitive.
My biggest concern, of course, was compatibility with my 100s and 100s of Word documents, spreadsheets, and of course with Outlook, all my email contacts and calendar events/schedule. But my concerns were unfounded. All my Word documents and Excel spreadsheets worked perfectly in the new Office programs and everything from Outlook 2007 imported perfectly into Outlook 2016 - including all my contacts, old emails, email rules (with a couple minor exceptions there), scheduled appointments and other calendar events (like grandkid's birthdays, etc.).
You say Office 2007 is fully updated, but it's not current.
Support ended over 3 years ago.
You really do need to bite the bullet and either upgrade to a newer version of Office, or as suggested go with LibreOffice, which is fully compatible with your Office 2007 programs (and documents!) and of course, is 100% free!