WORKING OFFLINE

If the status bar at the bottom of your Outlook window shows either of these status indicators, it means Outlook isn’t connected to your mail server.
 
Click Send/Receive > Work Offline to turn to reconnect.
 
Working offline option on the Send Receive tab
 
File->Info->Account Settings->Account Settings->Change->More Settings->General->Manually control connection state->Connect with network


MS Outlook 2010 set online mode on startup