While compiling the object id 5301 "Outlook Synch. NAV Mgt", you may receive the below mentioned error - Error 1 - --------------------------- Microsoft Dynamics NAV Development Environment --------------------------- Could not load type 'Microsoft.Dynamics.NAV.OLSync.Common.XmlTextWriter.'Microsoft.Dynamics.Nav.OLSync.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35''. --------------------------- OK --------------------------- Error 2 - --------------------------- Microsoft Dynamics NAV Development Environment --------------------------- You have specified an unknown variable. XmlTextWriter Define the variable under 'Global C/AL symbols'. --------------------------- OK --------------------------- Resolution - Step 1) Step 2) Try compiling the object on the system which you added Office outlook integration. Please feel free to get in touch in case you