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徵兆 

MICROSOFT Exchange Information Store (MSExchangeIS) 服務偶爾會停止回應,並記錄下列事件標識符 1002 專案: 

Unhandled exception (System.NullReferenceException: Object reference not set to an instance of an object.

   at Microsoft.Exchange.Server.Storage.LogicalDataModel.SearchFolder.BaseViewOperatorDefinition(Context context, Mailbox mailbox, IList`1 columnsToFetch, SearchCriteria criteria, Nullable`1 associated)

   at Microsoft.Exchange.Server.Storage.LogicalDataModel.SearchFolder.<DoSearchPopulation>d__210.MoveNext()

   at Microsoft.Exchange.Protocols.MAPI.MapiViewMessage.<CreateMaterializedRestrictionAndPopulate>d__138.MoveNext()

   at Microsoft.Exchange.Server.Storage.MapiDisp.MailboxTaskQueue.RunTaskStep(MailboxTaskContext mailboxTaskContext, QueueItem

原因

MSExchangeIS 程式會因為未處理的 System.NullReferenceExceptions 例外狀況而停止回應,此例外狀況每天產生多次。

解決方案 

若要修正此問題,請安裝下列累積更新: 

Exchange Server 2019 的累積更新 14 或 2019 年 Exchange Server 日之後的累積更新

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