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Exchange Web Services (EWS) deprecation

  1. Exclaimer Knowledge Base
  2. Frequently Asked Questions
  3. FAQ
Payal Arya
  • Updated
IMPORTANT! Sent Items Update Reauthorization 
Exclaimer has updated Sent Items Update to use the Microsoft Graph API instead of Exchange Web Services (EWS), ahead of Microsoft’s retirement of EWS in Exchange Online. 

If you use Sent Items Update, you need to reauthorize the service for it to continue operating. Your existing authorization was granted for EWS and needs to be reconfigured and reconsented to support the Microsoft Graph API. 

Without reauthorization, Sent Items Update will stop applying email signatures to your sent items. This change does not affect Exclaimer’s core signature deployment. Your server-side (mail flow) and client-side (Outlook) signature deployment will continue to operate as normal and requires no action. 
Am I affected if I only use client-side signatures / Outlook add-in / Cloud Signature Agent?
If you only use client-side signatures, the Outlook add-in, or the Cloud Signature Agent, you are not affected by changes to Sent Items Update, as this feature only applies to server-side signatures. 

The only exception is users of the Outlook add-in with Classic Outlook. If you use an outdated version of Classic Outlook, you may be affected. If you use an up-to-date version, you can safely ignore this notice.
Do we need to take any action?
The only action you may need to take is to re-authorise the Sent Items Update in the Exclaimer UI.
Will signatures still appear for email recipients after EWS retires — is only Sent Items affected?

Yes. This change will not affect signature imprinting on outgoing emails. Recipients will continue to receive emails with their signatures as normal.

Only the update of the copy stored in the sender's Sent Items folder is affected.

When will Exclaimer migrate from EWS to Microsoft Graph, and will Sent Items Update continue to work?

Exclaimer plans to migrate Sent Items Update from EWS to Microsoft Graph before October 2026. The migration depends on Microsoft making the required API changes available.

Exclaimer is currently targeting 8 September 2026 for the migration. This date may change if Microsoft’s API changes are not available as expected.

How do I check if my Exclaimer setup is using EWS / Sent Items Update?

In your Exclaimer Cloud subscription, select the cogwheel icon in the header bar, then select Mail Flow. 

Navigate to the Sent Items Update section to check whether you have enabled the feature.

You can also check in the Microsoft Entra ID Administration Center. Select Manage, then select Enterprise applications and look for the Exclaimer application associated with Sent Items Update.

Does EWS retirement affect Exchange hybrid environments?
EWS retirement only affects cloud-based mailboxes that use server-side signatures. On-premises mailboxes are not affected.
I am a reseller — how do I identify which of my clients are affected?

We do not currently provide a tool that allows MSPs or resellers to identify which client subscriptions have Sent Items Update enabled.

If you need to identify affected subscriptions, contact Exclaimer Support. We can check the relevant logs for specific subscriptions to determine whether they use Sent Items Update.