Hi Experts,
Currently encoutering an issue when we enable a user mailbox in EMC. The LegacyExchangeDN attribute will end with a random 3 character hex. For example the LegacyExchangeDN will show /o=<Exch Org Name>/ou=Exchange Administrative Group(FYDIBOHF23SPDLT)/cn=Recipients/cn=<firstname>.<lastname>f45 where f45 is the random hex.
In our environment, the user CN, mailNickName, name, sAMAccountName attributes are all <firstname>.<lastname>. The mail attribute is <firstname>.<lastname>@company.com.
To my understanding, the legacyExchangeDN is populated based on the mailNickName and has to be unique in the org as this is the value Exchange uses for internal mail routing. I found a reference online whereby if there is a conflict in the LegacyExchangeDN value, AD/Exchange will automatically append the value with a random 8 digit number to ensure uniqueness when a new mailbox is enabled. I haven't found anything related to appending a hex value.
Also I queried my AD for legacyExchangeDN attribute matching "/o=<Exch Org Name>/ou=Exchange Administrative Group(FYDIBOHF23SPDLT)/cn=Recipients/cn=<firstname>.<lastname>" for a particular user before mailbox enabling them in Exchange. No matches returned but when I mailbox enabled them and check the attribute afterwards, a random 3 character hex is there!
Tried creating a brand new user and same thing happens.
When Exchange was first installed, we did not have this problem, its only with the last few mailbox activation (enabling) that this is happening. Only thing that I can think of that has changed recently is updating to SP1 RU6 from SP1.
Anyone else encounter this issue before?
Thanks