| Event Id | 1163 |
| Source | Active Directory |
| Description | Failed to allocate the necessary memory while the hierarchy table was being calculated. Increase the amount of available memory. |
| Event Information | While rebuilding the Address Book hierarchy table, Active Directory could not allocate the requested memory for this task. Increase the physical memory or virtual memory. For more information about increasing virtual memory, see Help. |
| Reference Links | Monitoring AD Changes: Article |
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