I've Exchange 2007 with 2 'Mail User' accounts. Both from my perspective look the same (same type of email addreses, their accounts in Exchange and AD looks identical. What is the diffrence between those 2 icons shown in Outlook GAL? They both have external SMTP addreses set.
The difference between 2 icons in Outlook (Exchange GAL)
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Best Answer
What you see are:
This is commonly seen in organizations that have more than one email messaging platform deployed, ie. Exchange coexisting with a linux-based mail platform sharing the same recipient domain/namespace.