Describes errors that you receive when you sign in to Microsoft Lync Mobile on your Apple iOS-based device. Provides a solution.

If you plan to exchange digitally-signed documents together with other people, and you want the recipients of your documents to be able to verify the authenticity of your digital signature, you can obtain a digital certificate from a reputable third-party certificate authority (CA).

Send digitally signed messages as clear text if you want to make sure that your digitally signed messages can be opened by all recipients, even if they do not have an S/MIME mail application and can't verify the certificate.

Certificates are moved to the device via email. You will need to export a password-protected .pfx file, and email it to yourself. Then tap on that .pfx file to install it onto the device/Outlook mobile. The following image shows how manual certificate delivery works in iOS.

When you send a digitally-signed macro or document, you also send your certificate and public key. Certificates are issued by a certification authority, and like a driver’s license, can be revoked.

This solution enables you to resolve the issue quickly for individual Mac clients without having to reissue the certificate. When you receive the certificate warning message, click Show Certificate.

Apple Mail supports Modern Authentication by default when you setup the account as Outlook.com. If you use Apple Mail and you are seeing password prompts or connection errors, this is most likely happening because your account got configured as basic authentication.

Learn how to resolve the error in Outlook Mail and Outlook Calendar when the device doesn't meet the security requirements set by your email administrator.

Certificates can be obtained by exporting a password-protected .pfx file from Microsoft Outlook and emailing these to yourself. Tap on the .pfx attachment to begin the certificate installation. You can contact your IT help desk for assistance.

If you want to insert a digital signature into an email, you need to install a digital ID (certificate), which is verified by a third party. Before you can send and receive messages with encryption or digital signatures, or digital IDs, please follow the instructions to set up encryption in Outlook.