The installed trial version of Microsoft Office 365 as part of the Windows 10 Operating System will accept any valid 25-digit Product Code for any version of Microsoft Office. Yes, you would be able to use the 25-digit Product Code from the one-time charge version of Microsoft Office with this installed version.

This is a traditional laptop. It does not have 360-degree hinges for tablet-mode. It does have 180-degree hinges that allow the screen to lay flat.

No. The Lenovo IdeaPad S340-15 Laptop, model number 81QG000DUS, is a North American model. The limited 1-year manufacturer's warranty is valid in the USA/Canada only.

The Lenovo IdeaPad S340-15 Laptop, model number 81QG000DUS, ships with an AC adapter/charger and a 10-key numeric keypad along with its standard QWERTY keyboard. This system uses Windows 10 S-Mode Operating System. Windows 10 S-Mode provides added security by only allowing APPs available ( and therefore certified by Microsoft) at the Microsoft Store. If you don't need the added security or you need to install APPs not available at the Microsoft Store, you can switch to standard Windows 10 Home 64-bit Operating System, at no additional cost. Whether this configuration is compatible with specific hardware/software will depend on the requirements and compatibility of that specific hardware/software. We recommend you check with both the hardware and the software publisher's web sites for their compatibility with Windows 10 S-Mode 64-bit operating system and the minimum/recommended hardware requirements (Is a Graphics card required, the processor speed and the minimum required system RAM and the minimum available hard drive space) to run their program, then compare those requirements to this system's configuration.