You can run the cmdlet Set-RpcClientAccess –Server > –EncryptionRequired $False on all CAS Servers and all Mailbox Servers housing Public Folder Databases. Not that I'd particularly recommend it, but you can also remove the requirement of encryption on the Exchange Server if you so desire (note it's just the requirement of encryption, it doesn't disable encryption of Outlook tries to use it). ![]() It should think about it for a second, connect and download the new items. OK out of all the screens and load up Outlook. Being a powerful server-side application, Exchange server is mainly used with client-side applications (MS Outlook most often) to provide email-based collaborative communication to conveniently access the data from anywhere, when connected to the internet. On the Security tab, make sure the Encrypt data between Microsoft Office Outlook and Microsoft Exchange Server option is checked. Most organizations use Microsoft Outlook in conjunction with Exchange Server for its email-based communication. ![]() Select your Exchange Mailbox and click the Change button Open the Control Panel and load the Mail applet. I just so happen to have some pre-baked instructions for our users for this kind of thing! There's also this Microsoft KB article if you fancy excruciating detail. Microsoft has announced that after November 1, 2021, only Outlook 2013 Service Pack 1 (with latest fixes) and later will be able to connect to Microsoft 365 services. It could be that you haven't enabled the encryption between Outlook 2003 and your Exchange Server. Companies are often dead-slow in upgrading their deployed software, and if your setup is ancient you may soon run into trouble connecting to a Microsoft 365 Exchange server in the cloud.
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