Exchange Online User License migration FAQs

Many people worry about whether data will be lost during exchange online license migration.

For example, if the user has used the E4 license, can he transfer it to the Exchange Online license without loss. No problem in my test

For example, if the user has already used the E3 license and is now transferred to the E2 license, there is no problem with the user data.

However, we recommend that you back up your exchange online user data to ensure your security.

Http://help.outlook.com/en-us/140/hh310373.aspx

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Exchange Online User License migration FAQs