Switching Data Loss Prevention Client-Side Checks for OWA
Purview Data Loss Prevention (DLP) rule checks can happen client-side and server-side. This change updates the Exchange Online organization configuration to instruct OWA to stop using Exchange Online to detect potential DLP rule violations before users send email. Instead, OWA will use the workload-neutral Data Classification Services (DCS). Using a workload-neutral service comes with some consequences in terms of OWA being unable to evaluate Exchange-specific predicates. https://office365itpros.com/2026/05/22/data-loss-prevention-dcs/
outlook.office.com
I canno´t login in to outlook.office.com. Get the error message: UTC Date: 2026-04-05T10:38:19.885Z Client Id: C0B69CD1666C4BDCAD56171753860EF7 Session Id: e31a271e-c7b2-4f5f-abb5-854f463bfe2a Client Version: 20260320002.12 BootResult: configuration Back Filled Errors: Unhandled Rejection: Error: 500:undefined|undefined:undefined err: Microsoft.Exchange.Data.Storage.TenantAccessBlockedException esrc: StartupData et: ServerError estack: Error: 500 at Object.y [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.ad50be7b.js:2:299099) at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.ad50be7b.js:2:23784 st: 500 ehk: X-OWA-Error efe: GV2PEPF0002396F ewsver: 15.20.9769.16 emsg: TenantAccessBlockedError And outlook on my devices don´t sync to exchange server Need some serious help/rzs43
Prevent Microsoft 365 meeting invites from automatically appearing in users’ calendars
Hi All, We are trying to prevent Microsoft 365 meeting invites from automatically appearing in users’ calendars as Tentative until the user explicitly accepts the invite. Setting for Outlook Classic, New Outlook and Windows or Outlook Web. Need Microsoft recommendation on this one.
Outlook web UTF-8 charset
Outlook Web sends emails in my organization using the ISO-8859-1 character set. However, Copilot claims: "Outlook Web (Outlook on the Web, OWA) does not generate your messages in ISO-8859-1. It always uses UTF-8." My Outlook Web only switches to the UTF-8 character set if the email contains Unicode characters that cannot be displayed in ISO-8859-1. How can I enforce UTF-8 globally for my organization?
Shortcuts appearing when using Option+arrow in Outlook on Chrome in Mac
luse Outlook on Chrome in my MacBook Pro. While typing an email, though, if I use Option tarrow left or right (to go back or forth between words), after a few words, the shortcut letters for the menus pop up, and stop what I'm doing. (See image.) It doesn't happen in any other window on Chrome. So it's not a Chrome thing. It's only when Outlook 365 is loaded. (Don't know if it happens in other 365 apps, as I only use Outlook, really.) Anyone experienced that? And, if so, is there a solution? I tried Outlook 365's setting, but nothing there. Thanks!
Outlook for the web - some tenants not showing reply/forwarded icons in message list
Hi, (Outlook for the web) I wondered if anyone has experienced this and knows of any way to resolve it. One of my users is reporting that (and I have seen it) new replies are not being "flagged" with the reply icon in the message list. This appears to happen regardless of whether the email is in the inbox or a subfolder. Older emails (that have been replied-to or forwarded prior to today) are showing the relevant icons to indicate that a reply has been sent and it only appears to be affecting new replies/forwards. I've been through all the view settings in and nothing helps. I even tried crazy things like changing themes. This doesn't appear to be consistent across tenants either. I've seen 1 tenant with it working and another with it not working. Regards, PaulSync Issues with Tracking Meetings from Outlook to Dynamics 365
Hello, my work uses the Dynamic 365 App for Outlook to track meetings as appointments in Dynamics 365, but it has failed several times for several users (on both Mac and Windows, in Old and New Outlook and on web browsers); some meetings will fail to track immediately while in some cases, meetings that were successfully tracked will stopped working and are no longer tracked in Dynamics. In the spoiler below is a sanitized version of the diagnostic log for meetings that used to be tracked that stopped working: In the log, we have the following error message: "lastsyncerror": "ExchangeSyncGeneralCrmItemSyncError;Microsoft.Crm.Asynchronous.EmailConnector.ErrorSource.Crm:130;T:188\r\nActivityId: [Removed]\r\n>Exception : Microsoft.Crm.Asynchronous.EmailConnector.ExchangeSyncException: Failed to sync item to CRM server : System.ServiceModel.FaultException`1[Microsoft.Xrm.Sdk.OrganizationServiceFault]: There is no active transaction. This error is usually caused by custom plug-ins that ignore errors from service calls and continue processing. at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +0x27 at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +0x1ba at Microsoft.Xrm.Sdk.IOrganizationService.Execute(OrganizationRequest request) at Microsoft.Xrm.Sdk.WebServiceClient.WebProxyClient`1.ExecuteAction[TResult](Func`1 action) +0x15 at CrmSDKLib.OrganizationServiceWrapper.<>c__DisplayClass10_0.<Execute>b__0() in C:\\__w\\1\\s\\src\\lib\\CrmSDK\\OrganizationServiceWrapper.cs:line 13..." In Outlook, when I look at these meetings and check the app it gives the message: Recurring appointment occurrence cannot be tracked However, we have other series of recurring meetings that have been successfully tracked that does not run into the issue. Anyone has encountered this or similar issue? How do we resolve this so going forward the app can track all meetings without issue? Please let me know, thank you!Can't add Viva Engage community calendar to Outlook
We would like to experiment with using the SharePoint Online Web part that allows you to display a group calendar on a SharePoint Online page. Our idea is to use a Viva Engage community as a means to create that group calendar so that the features of a community can also be used for this scenario. I assumed that it worked similarly to Microsoft Teams whereas along as the "HiddenFromExchangeClientsEnabled" property is FALSE for the connected group, that either all community admins/members would see the group calendar show up in Outlook automatically OR you could manually add the calendar in your calendar lists in Outlook. Neither seem to be the case. What's interesting about the group that connects to a Viva Engage community is the ""HiddenFromExchangeClientsEnabled" property is FALSE by default. However, the group calendar does not appear in Outlook. As a community admin, I tried to manually add the calendar and I get an error message "Couldn't add [group]. You may not have permissions". Does anyone know why I'm running into that error and/or why the group mailbox is not showing up in Outlook by default since the property states that it is not hidden? Is it not possible to view Viva Engage group calendars in Outlook? Thanks!
