Email tracking issue

One of my users is experiencing issues when tracking emails. 

When they try to select a contact in the set regarding field they get the following error report.

Microsoft Dynamics CRM Error Report Contents

 <CrmScriptErrorReport>

  <ReportVersion>1.0</ReportVersion>

  <ScriptErrorDetails>

   <Message>Could not complete the operation due to error 800a139e.</Message>

   <Line>1</Line>

   <URL>/_static/_grid/GridControl.js?ver=-1027627317</URL>

   <PageURL>/_controls/lookup/lookupinfo.aspx?LookupStyle=single&browse=0&enableRemoveBtn=0&objecttypes=1%2c2%2c3%2c4%2c112%2c1010%2c1084%2c1088%2c1090%2c4400%2c4402%2c4406%2c4700%2c10000</PageURL>

   <Function>anonymous(){if(this.get_isDisposed()||IsNull(this.$0_3)||this.$0_3.get_isDisposed())return;this.$o_3=-1;if(!this.$1O_3||IsNull(this.get_id()))return;try{var$v_0=this.$4P_3();if($v_0.length>0&&this.$30_3()&&!IsNull(this.$C_3)&&this.$C_3.PresenceEnabled){th</Function>

   <CallStack>

    <Function>anonymous(){if(this.get_isDisposed()||IsNull(this.$0_3)||this.$0_3.get_isDisposed())return;this.$o_3=-1;if(!this.$1O_3||IsNull(this.get_id()))return;try{var$v_0=this.$4P_3();if($v_0.length>0&&this.$30_3()&&!IsNull(this.$C_3)&&this.$C_3.PresenceEnabled){this.$1W_3={};this.$25_3={};if(IsNull(this.$O_3)){var$v_1=$get(this.get_id()+"_divDataArea");if(!IsNull($v_1)){this.$O_3={};this.$O_3.OriginalScrollFunc=$v_1.scroll;this.$O_3.InscrollFunc=false;$addHandler($v_1,"scroll",this.$$d_$5G_3)}}this.$4E_3($v_0)}if(IsNull(this.$1Z_3))this.$1Z_3=$v_0.length>0}catch($v_2){if(this.$1O_3)throwError.create($v_2.message)}}</Function>

   </CallStack>

  </ScriptErrorDetails>

  <ClientInformation>

   <BrowserUserAgent>Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; Microsoft Outlook 14.0.6131)</BrowserUserAgent>

   <BrowserLanguage>en-us</BrowserLanguage>

   <SystemLanguage>en-us</SystemLanguage>

   <UserLanguage>en-us</UserLanguage>

   <ScreenResolution>1680x1050</ScreenResolution>

   <ClientName>Outlook Laptop - Online</ClientName>

   <ClientTime>2013-04-10T14:19:58</ClientTime>

  </ClientInformation>

  <ServerInformation>

    <OrgLanguage>1033</OrgLanguage>

    <OrgCulture>1033</OrgCulture>

    <UserLanguage>1033</UserLanguage>

    <UserCulture>1033</UserCulture>

    <OrgID>{2776D073-6D7C-4DE9-A695-AD57BD729AE3}</OrgID>

    <UserID>{BAC16ACF-4E75-E211-B4D4-78E3B511B67B}</UserID>

    <CRMVersion>5.0.9690.3351</CRMVersion>

  </ServerInformation>

</CrmScriptErrorReport>

<CrmScriptErrorReport>

  <ReportVersion>1.0</ReportVersion>

  <ScriptErrorDetails>

   <Message>Could not complete the operation due to error 800a139e.</Message>

   <Line>1</Line>

   <URL>/_static/_grid/GridControl.js?ver=-1027627317</URL>

   <PageURL>/_controls/lookup/lookupinfo.aspx?LookupStyle=single&browse=0&enableRemoveBtn=0&objecttypes=1%2c2%2c3%2c4%2c112%2c1010%2c1084%2c1088%2c1090%2c4400%2c4402%2c4406%2c4700%2c10000</PageURL>

   <Function>anonymous(){if(this.get_isDisposed()||IsNull(this.$0_3)||this.$0_3.get_isDisposed())return;this.$o_3=-1;if(!this.$1O_3||IsNull(this.get_id()))return;try{var$v_0=this.$4P_3();if($v_0.length>0&&this.$30_3()&&!IsNull(this.$C_3)&&this.$C_3.PresenceEnabled){th</Function>

   <CallStack>

    <Function>anonymous(){if(this.get_isDisposed()||IsNull(this.$0_3)||this.$0_3.get_isDisposed())return;this.$o_3=-1;if(!this.$1O_3||IsNull(this.get_id()))return;try{var$v_0=this.$4P_3();if($v_0.length>0&&this.$30_3()&&!IsNull(this.$C_3)&&this.$C_3.PresenceEnabled){this.$1W_3={};this.$25_3={};if(IsNull(this.$O_3)){var$v_1=$get(this.get_id()+"_divDataArea");if(!IsNull($v_1)){this.$O_3={};this.$O_3.OriginalScrollFunc=$v_1.scroll;this.$O_3.InscrollFunc=false;$addHandler($v_1,"scroll",this.$$d_$5G_3)}}this.$4E_3($v_0)}if(IsNull(this.$1Z_3))this.$1Z_3=$v_0.length>0}catch($v_2){if(this.$1O_3)throwError.create($v_2.message)}}</Function>

   </CallStack>

  </ScriptErrorDetails>

  <ClientInformation>

   <BrowserUserAgent>Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; Microsoft Outlook 14.0.6131)</BrowserUserAgent>

   <BrowserLanguage>en-us</BrowserLanguage>

   <SystemLanguage>en-us</SystemLanguage>

   <UserLanguage>en-us</UserLanguage>

   <ScreenResolution>1680x1050</ScreenResolution>

   <ClientName>Outlook Laptop - Online</ClientName>

   <ClientTime>2013-04-10T14:20:12</ClientTime>

  </ClientInformation>

  <ServerInformation>

    <OrgLanguage>1033</OrgLanguage>

    <OrgCulture>1033</OrgCulture>

    <UserLanguage>1033</UserLanguage>

    <UserCulture>1033</UserCulture>

    <OrgID>{2776D073-6D7C-4DE9-A695-AD57BD729AE3}</OrgID>

    <UserID>{BAC16ACF-4E75-E211-B4D4-78E3B511B67B}</UserID>

    <CRMVersion>5.0.9690.3351</CRMVersion>

  </ServerInformation>

</CrmScriptErrorReport>

The event viewer also logs this sometimes

An error occurred retrieving data from the Microsoft CRM server for processing Microsoft CRM-related e-mail messages.  Not all CRM-related e-mail messages may be marked appropriately.  Verify that the current user has appropriate permissions and server connectivity and try the action again. HR=0x80131501. Context=. Function=CEmailTagger::Run. Line=410.

They have the same permissions as others in the organization but the other users do not encounter the errors.