Message ID: MC884017
We’re making some changes to allowed size and count of values for various Exchange properties, here are the definition of the limits:
- Max length: Size of each value
- Max Count: Total count of values
[When this will happen:]
Changes will be applied in two phases between late September 2024 and late November 2024
[How this affects your organization:]
When this change takes effect, you will not be able to exceed the allowed limits
Starting late September 2024, we’re adding the following limits to these properties:
Phase1:
| Property | Max Length | Max Count |
| CloudMSExchUCVoiceMailSettings | 1123 | 20 |
| MSExchArchiveName | 512 | 20 |
| MSExchResourceMetadata | 1024 | 20 |
| MSExchSenderHintTranslations | 500 | 20 |
| ExchangeResources | 1024 | 20 |
Starting late November 2024, we’ll be adding limits to the following properties:
Phase 2:
| Property | Max Length | Max Count |
| CloudMSRtcPolicyAssignments | 128 | 45 |
| MSExchResourceSearchProperties | 1024 | 35 |
| CloudMSExchUserHoldPolicies | 40 | 1150 |
| MSExchExtensionCustomAttribute1 | 2048 | 750 |
| MSExchExtensionCustomAttribute2 | 2048 | 750 |
| MSExchExtensionCustomAttribute3 | 2048 | 400 |
| MSExchExtensionCustomAttribute4 | 2048 | 400 |
| MSExchExtensionCustomAttribute5 | 2048 | 250 |
| ValidationError | 948000 | 10 |
| ProxyAddresses | 1123 | 1200 |
[What you can do to prepare:]
Review the new limits and take action as appropriate for your organization.
Source: Microsoft
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