For synchronizing users with Office 365 Germany and Office 365 operated by 21Vianet, please refer to the corresponding manual chapter.Ĭonnecting MailStore Server and Microsoft 365 National clouds such as Microsoft Cloud for US Government, Microsoft Cloud Germany (operated by T-Systems) and Azure and Microsoft 365 operated by 21Vianet in China are not supported.

MailStore Server supports synchronizing user accounts with Microsoft 365 (Modern Authentication) only with the global Microsoft Cloud.

When using Microsoft 365 to authenticate users at login, accessing the archive via IMAP is not possible for technical reasons.

If users are supposed to log in to MailStore Server from outside the organization's network without a VPN using MailStore Client, MailStore Outlook Add-in or the Web Access, the URIs mentioned in this article must be resolvable via DNS on the Internet and port-forwardings to the MailStore Server computer must be set up on the firewall or router if necessary.

Using a certificate that is signed by a trusted certificate authority or using Let's Encrypt certificates is highly recommended.

For best user experience, the certificate used by MailStore Server should be trusted by all clients and the used web browsers.

Prerequisites, Recommendations and Limitations

4 Running Directory Services Synchronization.

2.6 Configuring API Permissions in Azure AD.

2.5 Configuring the Redirect URI in MailStore Server.

2.4 Configuring App Authentication in Azure AD.2.2 Creating Credentials in MailStore Server.

2.1 Registering of MailStore Server as App in Azure AD.2 Connecting MailStore Server and Microsoft 365.

1 Prerequisites, Recommendations and Limitations.

How to sync office 365 setup