MailStore Version 26.1: New Archiving Profiles With Microsoft Graph and Improved Compliance Features

We’d like to present a new version of our email archiving software today: Version 26.1 of MailStore Server, the MailStore Service Provider Edition (SPE) and MailStore Home is now available.

New Features in MailStore Version 26.1

With MailStore 26.1, you can look forward to new archiving profiles with Microsoft Graph, improvements to the Management API, and many other enhancements. We would also like to prepare you for the end of support for external databases (PSQL, MSQL) and MailStore Proxy.

New Archiving Profiles With Microsoft Graph

Microsoft has announced that Exchange Web Services (EWS) will no longer be supported for Exchange Online as of October 1, 2026. To prepare our customers for this change, MailStore 26.1 introduces new archiving profiles that already leverage Microsoft Graph, ensuring future-proof email archiving. Learn more here.

Enhancements to the Management API – of Particular Interest to our MailStore SPE Customers

Release 26.1 includes some enhancements to the Management API. Certificates (credentials) for connecting to Microsoft 365/Entra ID and for MailStore Cloud Export can now be managed and updated remotely. This is particularly helpful for managed service providers, who operate customer instances on behalf of their customers.

Early Announcement: Support of External Databases (PSQL, MSQL) and MailStore Proxy Will Be Deprecated Soon

Security and performance are top priorities at MailStore. For these reasons, we have decided to remove the support of Microsoft SQL Server, PostgreSQL and MailStore Proxy from MailStore Server by end of 2026. This reduces potential security risks and streamlines the system architecture. The built-in database provides fast and reliable access to all your data archived. Please refer to the online help and prepare for transferring external databases. Customers, still using the MailStore Proxy (our former inline SMTP gateway) shall review our recommendations to move to the MailStore Gateway.

To enable and simplify migration, especially for MailStore Server customers, archive stores can now be transferred from one location to another. It is even possible to merge archive stores via the API. This facilitates data migration, especially from external archive stores.

Some Minor but Useful Improvements

There are several minor improvements that MailStore users and administrators will appreciate. For instance, the status bar in the MailStore Client now shows the number of selected messages and the name of the user logged in. We have included the number of archived emails per profile in the status report, providing better visibility into archiving activity. To further enhance security, changing a user password by the administrator terminates all active sessions for that user, and changing one’s own password terminates all active sessions for that user except the current one.
And finally, since software security and reliability is a top priority at MailStore, we have also fixed some bugs and updated several 3^rd party libraries.

Updated Certification: Meeting Data Privacy Requirements

As usual, the latest version of our software, Version 26.1 of MailStore Server and the MailStore SPE, has been certified by an independent data privacy expert.

The certification takes into account all relevant aspects of the European General Data Protection Regulation (GDPR) and affirms that, when used appropriately, both MailStore Server and the MailStore SPE meet all the requirements governing the processing of personal data set out in the GDPR.

You can request a copy of the official GDPR audit certificate as soon as it is available from [email protected].

Registered MailStore partners can download the certificates from our Partner Portal as soon as it is available or request it by email from [email protected].

Availability

You can download the new version of MailStore Server, the MailStore Service Provider Edition and MailStore Home free of charge from our website.

If your MailStore Server Update & Support Service has expired, please contact us to purchase an upgrade that will allow you to use the latest version of MailStore Server. Read here to find out about other good reasons for having an active Update & Support Service in place.

Interested companies can also download MailStore Server Version 26.1 as part of a free, 30-day trial. If you are an MSP and are interested in offering email archiving as a service based on the MailStore SPE, please contact our sales team at [email protected]. Alternatively, you can sign up as an authorized MailStore Partner with us right now for free.

Click Here for the Corresponding Changelogs

• MailStore Server: https://www.mailstore.com/en/products/mailstore-server/changelog/
• MailStore SPE: https://www.mailstore.com/en/products/mailstore-spe/changelog/
• MailStore Home: https://www.mailstore.com/en/products/mailstore-home/changelog/

Detailed information on recent versions can be found here:

• MailStore Version 25.4: Support For Microsoft Exchange Server SE and Improved Compliance Features
• MailStore Version 25.3: Indexing of E-invoices and OAuth2 for SMTP Connection to Microsoft 365
• MailStore Version 25.2: Support for OAuth Authentication for Outlook.com and Email Archiving for NoSpamProxy Users
• MailStore Version 25.1: Increased Security and Support for Microsoft Server 2025 and Microsoft Outlook 2024
• MailStore Version 24.4: New MailStore App for Outlook
• MailStore V24.3: Improved Search Function
• MailStore V24.2.2: Now Available
• MailStore V24.2.1: Hotfix!
• MailStore V24.2 Multi-Factor Authentication for Synchronized Users