I meant web apps
I would go with the web apps for the office stuff and recommend Thunderbird as a client for outlook.
This is true. However, changes aren’t always bad. Messing up keybindings and just moving around stuff just so that it looks “cleaner” is the absolutely worst thing to do. If you decide to completely redesign your UI you should at least give Users the Opportunity to still use the old UI. This way new Users can start working with your new UI and the rest can, if they want, learn the new UI.
This is especially the Case when you redesign your UI in a way so that its more Intuitive to new Users.
This is such a masterpiece from xkcd
Yes