Disabling ActiveSync 16.0 Support on Exchange Online

ActiveSync is a protocol primarily used to synchronize on mobile devices and third-party applications (for example, non-Microsoft mail apps on smartphones and tablets):

• email;
• calendar;
• contacts.

The deactivation only affects devices and clients using ActiveSync version 16.0 or earlier.

Clients compatible with ActiveSync 16.1 will continue to function normally.

In particular, the following may be affected:

• smartphones or tablets with outdated mail applications;
• third-party clients that are no longer maintained;
• legacy configurations no longer supported by the manufacturer.

Starting March 1st, 2026:

• devices using ActiveSync < 16.1 will no longer be able to synchronize with Exchange Online;
• access to email, calendar, and contacts through these clients will be automatically blocked by Microsoft servers.

Since mobile device configurations may vary, there is no single solution that applies to all cases.

It is recommended to:

• update the device operating system;
• update the email application in use;
• verify that the client supports ActiveSync version 16.1.

Alternatively, you can use one of the fully supported access methods.

Updated instructions for configuring University email are available in the Service Catalog – Email Services.

For further clarifications or assistance, you can contact the University IT Service Desk.