---
title: "Search Microsoft 365"
url: https://lookeen.com/use-cases/microsoft-365
lang: en
description: "Search Exchange Online, the Online Archive, shared mailboxes and OneDrive in one index – via the Microsoft Graph API, ready for EWS being switched off in Exchange Online."
published: 2026-10-12T10:00:00+00:00
modified: 2026-10-12T10:00:00+00:00
---

# Search Microsoft 365

Mailboxes, shared mailboxes, Online Archives and OneDrive – Lookeen Server searches Microsoft 365 together with your file servers and PST archives. Through the Microsoft Graph API, the interface Microsoft is moving everyone to.

[Talk to us](https://lookeen.com/contact) [Lookeen Server](https://lookeen.com/server)

## What Lookeen searches in Microsoft 365

Lookeen finds content in mailboxes, the Online Archive and OneDrive.

### Mailboxes

Emails with attachments, calendars, contacts and tasks – personal and in shared mailboxes.

### Online Archive

Every mailbox's Online Archive, together with current email.

### OneDrive

Personal files in OneDrive – searchable by content, with preview.

## The Online Archive – even after EWS is gone

What the end of EWS means for archive search and how Lookeen handles it.

### Microsoft is switching off EWS

Microsoft is retiring Exchange Web Services (EWS) in Exchange Online. Since October 2026, EWS is being disabled step by step across all organizations: anyone still using EWS has to allow each application individually by its App ID. By April 2027, EWS in Exchange Online is to be fully disabled. On-premises Exchange Server is not affected.

### Many tools lose the archive

The successor is the Microsoft Graph API. But general access to In-Place Archives through Graph is still on Microsoft's own roadmap – so many Graph-based tools can't reach the Online Archive at all.

### Lookeen searches it via Graph

Lookeen Server's Microsoft 365 connector indexes the Online Archive through the Graph API. Your archived email stays searchable – no matter when EWS is switched off in your tenant.

## Securely connected

Lookeen accesses Microsoft 365 with its own narrowly scoped permissions, and the index stays with you.

-   **App registration in Entra ID:** Lookeen Server signs in as an application (OAuth2 client credentials). A script sets up the registration with the required Graph permissions.
-   **Index on your own network:** Content is indexed and stored on your Lookeen Server – not in yet another cloud.
-   **Permissions respected:** Personal content is only visible to its owner; access to shared mailboxes is taken over from Microsoft 365.
-   **Both connectors side by side:** The EWS-based Office 365 connector and the Graph-based Microsoft 365 connector can run at the same time – for an orderly transition.

Learn more: [Email search](https://lookeen.com/use-cases/email-search) · [On-premises search](https://lookeen.com/use-cases/on-premises-search) · [PST archives](https://lookeen.com/use-cases/pst-archives)

[All use cases →](https://lookeen.com/use-cases)