Situation: Domain:A and Domain:B
Server 1: Win2012 + Exchange2013 + Domain A
Server 2: Win2012R2 + Domain B
user victor@domainA has mailbox now the same uservictor@domainB wonts to use in one logon the both.
so he wants to choise from wich account he sends email.
I tried to make a linked mailbox but I got this error: The value "victor@prinfotech.com" of property "UserPrincipalName" is used by another recipient object "". Please specify a unique value.
What went wrong.