troubleshooting Question

Exchange 2016: Seeing different mailbox GUID formats in Outlook profile

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BYS asked on
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When I look at the Outlook profile for mailboxes on Exchange 2016, different mailboxes have the GUID in different formats. Has anyone seen this before and know why they are different (for different mailboxes)?

Format 1: https://webmail.domain.com/mapi/emsmdb/?MailboxId=43993af8-5051-4c7a-8fc2-2f3363b083f2@domain.com

Format 2: a5fbac9f-76bc-4219-96bb-05ca9ef839bc@domain.com

outlook screenshot
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