When you remove an account from your device, everything associated with that account is also deleted from your device. This includes email, contacts, and settings.
- Open your device's Settings app .
- Under "Personal," tap Accounts
- Tap the account you want to remove. If it's your Google Account, first tap Google.
- Tap More Remove account.
- If this is the only Google Account on the device, you'll need to enter your device's pattern, PIN, or password for security.
Find more information located at the Office 365 Customer Care website.