Introducing Maximum days in advance policy to existing calendars

Hello everyone,

I have a question regarding creating a policy for O365.

We want to implement the Policy "Maximum days in advance" from O365 with Exchange Server.

We would like to know what happens to existing appointments which are scheduled for longer than what the Policy defines.
Are they deleted, changed or do they remain untouched?

Thank you in advance!

Kind regards,

Marius T.