A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
Hi Iniobong,
It is best to have them connect their e-mail to Outlook (desktop) version and export the PST mailboxes from there.
Then when you migrate, you import the mailboxes in to their new mail using Outlook.
If this is helpful please accept as answer or upvote.
Best regards,
Dillon Silzer, Director | Cloudaen.com | Cloudaen Computing Solutions