| Event Id | 1029 |
| Source | MSExchangeFb |
| Description | Unable to find the MS Mail user MS:NETWORK/PONAME/USERNAME the Microsoft Exchange Address Book. This address is not defined in the Recipients container. Synchronize your MS Mail Postoffice addresses or create a custom recipient entry for this address. |
| Event Information | Following Microsoft article will give more information about this event. |
| Reference Links | XCLN: Free/Busy Connector Errors 1027 and 1029 |
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