Branded PowerPoint template - must be very easy to edit

Description

I'm looking for a branded PowerPoint template that everyone in the business can easily use and edit, even with limited PowerPoint/design skills.
We need a template that functions well rather than a work of art that is time consuming to edit :)
The template will be used for internal project updates, monthly reports, supplier sales updates, new customer proposals and more.
I will send our logo and brand guidelines for the fonts, colours, style etc.
The template should include 15-20 pick'n'mix slides to include:
- text- bullet points- images- tables- graphs / charts- process / flow diagram- meet the team- section dividers- contents- about us- front cover