You have a hybrid Exchange Server 2016 organization.
Users use Outlook on the web. All mailboxes currently reside on-premises.
You have an internal public key infrastructure (PKI) that uses a certification authority (CA) named CA1.
Certificates are issued to users to sign and encrypted email messages.
You move a mailbox to Exchange Online and you discover that the mailbox fails to exchange signed or
encrypted email messages from the on-premises mailbox users.
You need to ensure that all of the mailboxes that were moved to Exchange Online can send encrypted email
messages to the on-premises mailboxes.
The mailboxes must also be able to receive encrypted email messages from the on-premises mailboxes.
You export the required certificates to a file named Export.sst
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