In-Place archive API support.

Question

In-Place archive API support.

test folders 25

I got to know in another thread that Microsoft Graph does support In-Place Archive mailboxes, but these folders are separate from the primary mailbox.

So wanted to ask -

Can you tell me what is the exact Graph API endpoint to list the messages from an In-Place Archive mailbox folders?
Can you tell me how to obtain the folder IDs of the in-place archive mailbox folders? Since /mailFolders only targets the primary mailbox.

Naitik Jani 26 Reputation points

2026-08-18T09:18:48.9333333+00:00
In-Place Archive API support via Microsoft Graph — needed before EWS retirement (Oct 2026 / Apr 2027)

We currently use the EWS SDK (C#) to access In-Place Archive mailbox data (folders and messages) via WellKnownFolderName.ArchiveMsgFolderRoot, ArchiveInbox, etc. With EWS retirement scheduled (phased disablement starting October 1, 2026, full retirement April 1, 2027), we need to migrate this functionality to Microsoft Graph.

However, we've found that:

The standard /users/{id}/mailFolders and /messages endpoints only return data from the primary mailbox, not the in-place archive.

There is no documented header, query parameter, or endpoint in Graph v1.0 or beta that lets us target the in-place archive mailbox equivalent to EWS's AlternateMailbox/ArchiveMsgFolderRoot.

We found a related open question here , which indicates this is a known gap.

Could you confirm:

Is there any current (v1.0 or beta) Graph API endpoint or supported workaround to read In-Place Archive mailbox folders/messages in C#?

Is there a public roadmap or timeline for Graph API support of In-Place Archive, given the EWS retirement deadline?

What is the recommended interim approach for applications that rely on in-place archive access via EWS today?

This is time-sensitive given the EWS retirement schedule. Any guidance or ETA would be greatly appreciated.

Answer accepted by question author

Vasil Michev 127.6K MVP Volunteer Moderator

Not sure which thread you are referring to, but the info provided therein might be out of context. There is no support currently for any Online Archive related CRUD operations via the Graph API. The recently introduced Import/Export API does have support for it, but as the name suggests, only for specific scenarios. Here's the link to the relevant documentation, just in case: https://learn.microsoft.com/en-us/graph/api/mailbox-list-folders?view=graph-rest-beta&tabs=http

That said, Microsoft is working to address this as one of the major gaps with respect to the incoming deprecation of the EWS API, and a preview of that should be landing in the coming months.

test folders 25 Reputation points

2026-02-16T10:25:56.88+00:00

So using these CRUD APIs, we will be able to fetch Archive mailbox message data in MIME format?
Vasil Michev 127.6K Reputation points MVP Volunteer Moderator

2026-02-16T10:58:11.4166667+00:00

I cannot speak on behalf of Microsoft on that. We shall see once they release the new endpoints, which should happen in the coming months.

1 additional answer

Your answer

Naitik Jani 26 Reputation points

2026-08-18T09:18:48.9333333+00:00

In-Place Archive API support via Microsoft Graph — needed before EWS retirement (Oct 2026 / Apr 2027)

We currently use the EWS SDK (C#) to access In-Place Archive mailbox data (folders and messages) via WellKnownFolderName.ArchiveMsgFolderRoot, ArchiveInbox, etc. With EWS retirement scheduled (phased disablement starting October 1, 2026, full retirement April 1, 2027), we need to migrate this functionality to Microsoft Graph.

However, we've found that:

The standard /users/{id}/mailFolders and /messages endpoints only return data from the primary mailbox, not the in-place archive.

There is no documented header, query parameter, or endpoint in Graph v1.0 or beta that lets us target the in-place archive mailbox equivalent to EWS's AlternateMailbox/ArchiveMsgFolderRoot.

We found a related open question here , which indicates this is a known gap.

Could you confirm:

Is there any current (v1.0 or beta) Graph API endpoint or supported workaround to read In-Place Archive mailbox folders/messages in C#?

Is there a public roadmap or timeline for Graph API support of In-Place Archive, given the EWS retirement deadline?

What is the recommended interim approach for applications that rely on in-place archive access via EWS today?

This is time-sensitive given the EWS retirement schedule. Any guidance or ETA would be greatly appreciated.
test folders 25 Reputation points

2026-02-16T10:25:56.88+00:00

So using these CRUD APIs, we will be able to fetch Archive mailbox message data in MIME format?
Vasil Michev 127.6K Reputation points MVP Volunteer Moderator

2026-02-16T10:58:11.4166667+00:00

I cannot speak on behalf of Microsoft on that. We shall see once they release the new endpoints, which should happen in the coming months.

Answer 1

The Microsoft Graph API does not support accessing In-Place Archive mailboxes. Therefore, there are no specific endpoints available for listing messages from In-Place Archive mailbox folders or obtaining folder IDs for those mailboxes. The API is designed to access data in users' primary mailboxes and shared mailboxes, but not in In-Place Archive mailboxes, whether on Exchange Online or Exchange Server.

References: