Important: Cloud Drive Mapper V3, V2 and incoming MS changes
18 AUGUST 2025 · BY THE IAM CLOUD TEAM
Cloud Drive Mapper V3 has reached General Availability
After years of development, beta testing and pre-release, CDM V3.20 is now live. We're proud to announce that CDM V3 has reached General Availability.
If you are already exclusively using CDM V3 then good news, you can stop reading here. But if you are still using CDM V2 (either in full or in part), please read the rest of this post.
The Microsoft situation
This was always going to be an inflection point for us, and the start of a push towards CDM V3. However, due to some incoming changes with Microsoft services that impact CDM V2, the urgency is now higher. We now recommend starting the first steps on your journey to V3 as soon as you can.
Microsoft contacted us a few weeks ago to let us know about their plans to deprecate SharePoint's RPS service. While this doesn't directly impact WebDAV, it does affect the way that CDM V2 has historically generated cookies for WebDAV's authentication.
Microsoft have now started soft-disabling RPS in phases between now and the end of August. The good news is that RPS can be re-enabled with PowerShell, but only for a limited window.
CDM 2.24, a critical update for V2
If you do nothing, CDM V2 (2.22 or below) will stop working.
However, as well as launching CDM V3.20 in GA, we have just released an update to CDM V2 (CDM 2.24) that uses a different method for generating cookies. We have tested this with RPS disabled on a tenancy, and have confirmed it works successfully.
This fix means CDM V2 (2.24) will continue working even when RPS is removed.
Our recommendation
The interactions we've had with Microsoft recently have displayed a significant desire by MS to start shutting down legacy systems and protocols, including the WebDAV service itself. They have confirmed this will not happen this year, but it is now something they are actively planning.
Our recommendation: upgrade to CDM 2.24 immediately to handle the RPS change, then begin planning your V2 → V3 migration with intent.
If you need any assistance please contact our support team at support@iamcloud.com.
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