Outlook needs to be connected with the server to send & receive emails. If Microsoft Outlook cannot connect to the server, see this post.

If Microsoft Outlook has disconnected from the server, then this post will show you how to reconnect it on your Windows 11/10 computer.

Services & Software A fix for Outlook 2007's failure to link to Exchange Server 2003 The inability to connect from a Vista PC to an Exchange Server may be due to a conflict with the Windows Firewall.