NameSpace.Offline Property (Outlook)
Returns a Boolean indicating True if Outlook is offline (not connected to an Exchange server), and False if online (connected to an Exchange server). Read-only.
The Offline property returns valid information only for an Exchange profile. It is not intended for non-Exchange account types such as POP3, IMAPI, and HTTP.
If the NameSpace.ExchangeConnectionMode property is olOffline or olDisconnected, the Offline property will return True. If the ExchangeConnectionMode property is olOnline, olConnected, or olConnectedHeaders, the Offline property will return False.
The following Microsoft Visual Basic for Applications (VBA) example returns True or False depending on whether the NameSpace object is currently online.