Exchange2007使用WEB登录的问题（发邮件时无法添加附件）

我现在遇到一个问题：

我们客户在台湾使用WEB方式登录公司的邮件服务器（exchange2007+win2008）收发邮件正常，但是无法在回复邮件和发邮件时添加附件，在添加附件的时候会出现以下报错：

请问这是什么问题，应该怎么解决（注：exchange开启了循环日志，没有其他特别设定，数据库所在硬盘还有90G的空间）

Request
Url: https://222.72.137.136:443/owa/forms/basic/BasicEditMessage.aspx?ae=Item&t=IPM.Note&a=Open&s=Draft&id=RgAAAABQLYi6hku7RYCLieLVQWQbBwCghnj5ntgVR7J7hkx%2b%2bfVSAAAAAABoAACghnj5ntgVR7J7hkx%2b%2bfVSBMHkpJXCAAAJ
User host address: 58.38.124.32
User: A-Arthur Jen
EX Address: /o=arduous-industry/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=Jenhs
SMTP Address: Jenhs@arduous-industry.com
OWA version: 8.1.240.5
Mailbox server: WIN-1VE38UTY51A.arduous-industry.com

Exception
Exception type: Microsoft.Exchange.Data.Storage.StoragePermanentException
Exception message: Could not get properties.

Call stack
在 Microsoft.Exchange.Data.Storage.MapiPropertyBag.GetProperties(IList`1 propertyDefinitions) 在 Microsoft.Exchange.Data.Storage.StoreObjectPropertyBag.InternalLoad(PropertyDefinition[] properties, Boolean forceReload) 在 Microsoft.Exchange.Data.Storage.StoreObjectPropertyBag..ctor(StoreSession session, MapiProp mapiProp, Origin origin, PropertyDefinition[] autoloadProperties, Boolean canSaveOrDisposeMapiProp) 在 Microsoft.Exchange.Data.Storage.StoreObjectPropertyBag..ctor(StoreSession session, MapiProp mapiProp, Origin origin, PropertyDefinition[] autoloadProperties) 在 Microsoft.Exchange.Data.Storage.Item.InternalBindItem(StoreSession session, StoreObjectId itemId, Byte[] changeKey, ItemBindOption itemBindOption, PropertyDefinition[] allPropsToLoad) 在 Microsoft.Exchange.Data.Storage.Item.InternalBind[T](StoreSession session, StoreId id, ItemBindOption itemBindOption, PropertyDefinition[] allPropsToLoad) 在 Microsoft.Exchange.Data.Storage.Item.InternalBind[T](StoreSession session, StoreId id, PropertyDefinition[] allPropsToLoad) 在 Microsoft.Exchange.Clients.Owa.Core.Utilities.GetItem[T](StoreSession storeSession, StoreId storeId, Boolean forceAsMessageItem, PropertyDefinition[] prefetchProperties) 在 Microsoft.Exchange.Clients.Owa.Core.Utilities.GetItem[T](UserContext userContext, StoreId storeId, Boolean forceAsMessageItem, PropertyDefinition[] prefetchProperties) 在 Microsoft.Exchange.Clients.Owa.Core.Utilities.GetItem[T](UserContext userContext, StoreId storeId, PropertyDefinition[] prefetchProperties) 在 Microsoft.Exchange.Clients.Owa.Basic.EditMessage.LoadMessage() 在 Microsoft.Exchange.Clients.Owa.Basic.EditMessage.OnLoad(EventArgs e) 在 System.Web.UI.Control.LoadRecursive() 在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Inner Exception
Exception type: Microsoft.Mapi.MapiExceptionCallFailed
Exception message: MapiExceptionCallFailed: Unable to get properties on object. (hr=0x80004005, ec=-1073151871) Diagnostic context: Lid: 18969 EcDoRpcExt2 called [length=458] Lid: 27161 EcDoRpcExt2 returned [ec=0x0][length=405][latency=3868] Lid: 23226 --- ROP Parse Start --- Lid: 27962 ROP: ropOpenMessage [3] Lid: 27962 ROP: ropGetPropsSpecific [7] Lid: 17082 ROP Error: 0xC0090081 Lid: 26465 Lid: 21921 StoreEc: 0xC0090081 Lid: 27962 ROP: ropExtendedError [250] Lid: 1494 ---- Remote Context Beg ---- Lid: 26426 ROP: ropGetPropsSpecific [7] Lid: 21970 StoreEc: 0x8004010F PropTag: 0xE960102 Lid: 21970 StoreEc: 0x8004010F PropTag: 0x6708000B Lid: 21970 StoreEc: 0x8004010F PropTag: 0xE960102 Lid: 21970 StoreEc: 0x8004010F PropTag: 0x67760102 Lid: 25394 Lid: 19506 Lid: 27698 Lid: 11285 StoreEc: 0xC0090081 Lid: 5257 StoreEc: 0xC0090081 Lid: 1750 ---- Remote Context End ---- Lid: 26849 Lid: 21817 ROP Failure: 0xC0090081 Lid: 20385 Lid: 28577 StoreEc: 0xC0090081 Lid: 32001 Lid: 29953 StoreEc: 0xC0090081

Call stack
在 Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, Object objLastErrorInfo) 在 Microsoft.Mapi.MapiProp.GetProps(PropTag[] propTagsRequested) 在 Microsoft.Exchange.Data.Storage.MapiPropertyBag.GetProperties(IList`1 propertyDefinitions)