# What Changes from 20.04.xx to Versions 24.08 and 26.04

The most important difference from version 20.04 is not only Microsoft Graph: the way the connector is integrated into vtenext also changes.

## From 20.04 to the new structure

In version 20.04, Exchange Connector was installed using the legacy dedicated procedure and was not registered as a standard vtenext vtlib module.

In versions 24.08 and 26.04, the connector is managed as a real vtenext module/extension. After the first migration, future upgrades can therefore be handled through the normal module update procedure.

For this reason, moving from 20.04.xx to 24.08 or 26.04 requires a specific migration and a one-time module registration script.

## If Microsoft 365 is used

The new connector generation uses Microsoft Graph for Microsoft 365 / Exchange Online. After migration, the Office365 configuration and user connections must be checked.

The connector can use either **vtenext Proxy** or a **Custom Microsoft App**.

## If Exchange Server is used

Exchange Server installed on the customer infrastructure continues to use EWS. Supported configurations include Exchange 2016, Exchange 2019 and Exchange Server Subscription Edition.

## Future upgrades

Once Exchange Connector is already using the new structure, for example version 24.08, moving to 26.04 no longer requires the registration script.

- **20.04.xx → 24.08 or 26.04 = structural migration**;
- **24.08 → 26.04 = standard module upgrade**.