Updated September 6, 2024: Thank you for your feedback. We are going to provide a new Message center post shortly with more details to help you understand and act on this change. We apologize for the inconvenience, and you can safely disregard this message.
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.