Symptoms

In Microsoft Exchange Server 2019 or Exchange Server 2016, Managed Folder Assistant (MFA) fails on certain items, and you receive the following error message:

Log Name:      Application

Source:        MSExchange Assistants

Event ID:      9004

Task Category: Assistants

Level:         Warning

Description:

Service MSExchangeMailboxAssistants. 'Managed Folder Mailbox Assistant' failed to process mailbox. The following exception caused the failure: Microsoft.Exchange.Assistants.AIGrayException ---> Microsoft.Exchange.Common.GrayException ---> Microsoft.Exchange.Data.Storage.NotInBagPropertyErrorException: [0x1000001f] TextBody

at Microsoft.Exchange.Data.Storage.MemoryPropertyBag.TryGetStoreProperty(StorePropertyDefinition propertyDefinition)

at Microsoft.Exchange.Data.Storage.StoreObjectPropertyBag.TryGetStoreProperty(StorePropertyDefinition propertyDefinition)

at Microsoft.Exchange.Data.Storage.NativeStorePropertyDefinition.InternalTryGetValue(BasicPropertyStore propertyBag)

at Microsoft.Exchange.Data.Storage.PropertyBag.TryGetProperty(PropertyDefinition propertyDefinition)

at Microsoft.Exchange.Data.Storage.Body.CalculateRawFormat()

at Microsoft.Exchange.Data.Storage.Body.ChooseBestBody()

at Microsoft.Exchange.Data.Storage.Conversations.BodyFragmentsExtractor.ShouldExtractOnSave(ICoreItem coreItem, CoreItemOperation operation, FixupStage fixupStage)

at Microsoft.Exchange.Data.Storage.MessageItem.CoreObjectUpdateBodyFragmentList(IMailboxSession session, IMailboxOwner mailboxOwner, ICoreItem item, FixupStage fixupStage, CoreItemOperation operation)

at Microsoft.Exchange.Data.Storage.MessageItem.AggregateMessageInConversation(ICoreItem item, CoreItemOperation operation)

at Microsoft.Exchange.Data.Storage.MessageItemSchema.CoreObjectUpdate(CoreItem coreItem, CoreItemOperation operation)

at Microsoft.Exchange.Data.Storage.CoreItem.InternalFlush(SaveMode saveMode, CoreItemOperation operation, OperationContext operationContext)

at Microsoft.Exchange.Data.Storage.CoreItem.SaveOrSend(SaveMode saveMode, OperationContext operationContext, CoreItemOperation operation)

at Microsoft.Exchange.Data.Storage.Item.SaveInternal(SaveMode saveMode, Boolean commit, OperationContext operationContext, CoreItemOperation operation)

at Microsoft.Exchange.Data.Storage.Item.Save(SaveMode saveMode)

at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ItemPropertySynchronizer.<>c__DisplayClass26_0.<CommitChangesAlready>b__0()

at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate)

at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.ItemPropertySynchronizer.Update()

at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.FolderPropertySynchronizer.Update()

at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.Synchronizer.ProcessFolder(List`1 folderList)

at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.Synchronizer.UpdateEntireMailbox()

at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.TagProvisioner.InvokeInternal(MailboxDataForTags mailboxDataForTags)

at Microsoft.Exchange.MailboxAssistants.Assistants.ELC.TagProvisioner.Invoke(MailboxDataForTags mailboxDataForTags)

Resolution

To fix this issue, install one of the following updates:

For Exchange Server 2019, install the Cumulative Update 6 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.​

For Exchange Server 2016, install the Cumulative Update 17 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.

References

Learn about the  terminology that Microsoft uses to describe software updates.

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