Confirmation: Set-MsolUserLicense cmdlet behavior

Hello All - The cmdlet Set-MsolUserLicense takes 2 parameters 'AddLicenses' and 'RemoveLicenses'. If I want to switch a user from 1 plan to another, I will execute

Set-MsolUserLicense -ObjectID <guid_of_user> -AddLicenses 'MyDomain-Pack1' -RemoveLicenses 'MyDomain-Pack2'.

Let's assume both of the packs, pack1 and pack2 have exchange online included in them.

If I execute the above cmdlet, will the exchange online mailbox retain all the mailbox properties ?

If I first execute Set-MsolUserLicense -ObjectID <guid_of_user> -RemoveLicenses 'MyDomain-Pack2' and then execute Set-MsolUserLicense -ObjectID <guid_of_user> -AddLicenses 'MyDomain-Pack1'

will my exchange online mailbox loose all of it's properties set earlier?

please confirm. Thanks.