|Component:||Microsoft Exchange Information Store|
|Message:||An ambiguous SMTP proxy <name> was found on <number> mailboxes in the DS. The store cannot map this SMTP proxy to a unique Mailbox GUID.|
This event is caused by having duplicate proxies (firstname.lastname@example.org for example) on two or more objects. Administrators should determine which proxies have duplicates and remove those that are incorrect.
Change the Simple Mail Transfer Protocol (SMTP) e-mail address of one of the mailboxes, so that each mailbox has a unique address.