Oleksii Shevchenko
@shevsoftware.com
Independent consultant in Poland. I write about Exchange Online EWS retirement: two allow lists, usage-report limits, and dated evidence. I offer written EWS readiness audits. Sources and scope: shevsoftware.com
Correction: my August posts described a September-wide EWSAllowedAppIDs population. Microsoft’s 4 September guidance ties missing-list creation to each tenant’s rollout.
techcommunity.microsoft.com/blog/exchang...
techcommunity.microsoft.com/blog/exchang...
Take control of your EWSAllowedAppIDs list before EWS access changes | Microsoft Community Hub
We wanted to provide additional guidance on how admins should use the EWSAllowedAppIDs allow list during EWS deprecation.
techcommunity.microsoft.com
September 7, 2026 at 9:57 AM
Correction: my August posts described a September-wide EWSAllowedAppIDs population. Microsoft’s 4 September guidance ties missing-list creation to each tenant’s rollout.
techcommunity.microsoft.com/blog/exchang...
techcommunity.microsoft.com/blog/exchang...
Microsoft updated its EWS guidance on 1 Sep to clarify a naming trap: EWSAllowedAppIDs is the new App-ID gate; EWSAllowList/EWSBlockList are older User-Agent controls. They are evaluated independently, so passing one doesn't prove the other. www.shevsoftware.com/ews-allowlis...
EWS allow lists compared: App IDs and User-Agent policy — SHEV Software
The difference between EwsAllowedAppIDs and EwsApplicationAccessPolicy, including where User-Agent policy can affect Exchange-backed Microsoft Graph APIs.
www.shevsoftware.com
September 3, 2026 at 2:37 PM
Microsoft updated its EWS guidance on 1 Sep to clarify a naming trap: EWSAllowedAppIDs is the new App-ID gate; EWSAllowList/EWSBlockList are older User-Agent controls. They are evaluated independently, so passing one doesn't prove the other. www.shevsoftware.com/ews-allowlis...
First three qualified founding September Reviews: EUR 350 net per tenant (standard EUR 450; up to five EUR 1,450). Written, fixed scope: usage reconciled with the current allow-list snapshot, dated decision records per tenant. No tenant credentials. www.shevsoftware.com/september-re...
August 28, 2026 at 10:46 PM
First three qualified founding September Reviews: EUR 350 net per tenant (standard EUR 450; up to five EUR 1,450). Written, fixed scope: usage reconciled with the current allow-list snapshot, dated decision records per tenant. No tenant credentials. www.shevsoftware.com/september-re...
On 1 October the meaning of EWSEnabled=True changes in Exchange Online. Today, True with an empty allow list lets all EWS traffic through. After enforcement starts, the same setting blocks all EWS traffic except org relationships. Before/after table: www.shevsoftware.com/guide/
August 21, 2026 at 4:38 PM
On 1 October the meaning of EWSEnabled=True changes in Exchange Online. Today, True with an empty allow list lets all EWS traffic through. After enforcement starts, the same setting blocks all EWS traffic except org relationships. Before/after table: www.shevsoftware.com/guide/