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Add-PublicFolderClientPermission: Object reference not set to an instance of an object.
Running into an issue with adding public folder permissions in Exchange Online. I've used this PowerShell script for a few years without any issues, but suddenly getting this error no matter what I try. I do have Owner permissions and there are Default and Anonymous permissions on the public folder, tried completely removing and reinstalling the ExchangeOnlineManagement module as well. Anyone else having this problem? $PF = Get-MailPublicFolder -Identity "\pf1" $User = Get-User -Anr "User1" $AccessRights = @( "ReadItems", "CreateItems", "EditOwnedItems", "EditAllItems", "FolderVisible" ) Add-PublicFolderClientPermission -Identity "\$($PF.Id)" -User $User.UserPrincipalName -AccessRights $AccessRights -Verbose VERBOSE: Returning precomputed version info: 3.9.2 VERBOSE: Requested HTTP/1.1 POST with 227-byte payload VERBOSE: Received HTTP/1.1 response of content type application/json of unknown size VERBOSE: Query 1 failed. Add-PublicFolderClientPermission: Object reference not set to an instance of an object. Thank youOAB download fails after hybrid mailbox move.
Hi folks, I'm posting this query here as I doubt anyone in the Outlook forums would have the necessary Exchange hybrid knowledge. I run a classic hybrid Exchange environment where Exchange Server 2019 CU15 is the on-premise platform. Authentication is provided by on-premise AD FS, with the accounts being synchronised from on-premise via AAD Connect. I've just moved my on-premise mailbox to Exchange Online via New-MoveRequest and for the most part, everything is fine. One thing that possibly isn't fine - going off the Bits-Client event log is the regular offline address book downloads, where I'm seeing regular failures in the event log and through double-checking with bitsadmin.exe. The initial address book synchronisation worked as the view in Outlook is fully populated, however, I expect that future changes likely won't come through. bitsadmin output Event log output (There's numerous events to choose from - this is the one I'm most curious about.) The BITS service provided job credentials in response to the UNIDENTIFIED authentication challenge from the outlook.office365.com server for the Microsoft Outlook Offline Address Book <guid> transfer job that is associated with the following URL: /OAB/<guid>/oab.xml. The credentials for the <sid> user were rejected. When the mailbox was on-premise, the OAB came from the Exchange Server - no surprise there, where post migration it can be seen from the bitsadmin output it now comes from outlook.office365.com. Perhaps that's also to be expected - I don't know, but it makes sense given the move. What alerted me to there potentially being an issue is the systray icon frequently gets stuck on the "synchronising" icon, and running a manual full OAB sync from within Outlook fails to complete. After an extended "hang" period, the sync window eventually times out with the error shown above (the protracted UI behaviour would appear to be due to the large number of retries). Dropping the BITS job URL into Edge simply returns a HTTP 503, which doesn't necessarily strike me as a problem. After all, I'm unable to provide a BEARER token using this method. I haven't yet tried via PowerShell as it only occurred to me now but perhaps I'll do so after posting this. Searching on this error and scenario has turned up nothing useful. I have also checked and compared event log entries from an Azure AD-native account, where it's a mixed bag of successful OAB BITS downloads and unsuccessful ones that feature the same symptoms as above, which offers up the possibility this might be a transient service-side error (though I'm not leaning heavily towards this). Has anyone else encountered this issue and resolved it? Is it even an issue to begin with, or is this expected behaviour? I'm unsure what to make of the symptoms. Cheers, Lain
Emails from Azure Communication Services (ACS) are treated as external emails
When using Azure Communication Services (ACS) Email, messages are delivered to Microsoft 365 as external mail, even if the system sending them belongs to my own organization. This behavior can be expected because ACS sends emails from Microsoft’s cloud infrastructure rather than directly from my tenant. As a result, Distribution Groups (DG), Dynamic Distribution Groups (DDG), or Mail-enabled Security Groups (SG) that are configured to accept messages only from internal senders will reject these emails. The common workaround is to enable “Allow external senders” on the group. However, we don't want to open the group to the entire internet. Does anyone else have the same experience? What is the best solution, exchange transport rules? Thanks!TEST-OAuthConnectivity | The remote server returned an error: (403) Forbidden
Hello Exchange Tech Community, I have setup a lab environment of Exchange Server 2016 in Hybrid Configuration. I can successfully onboard and offboard mailboxes. OnPrem Exchange Server is I have a Microsoft 365 Business Basic subscription for Exchange Online. Entra ID Sync is working seamlessly. Email flow between OnPrem and EXO and vice versa work perfectly. When I am testing OAuth functionality from OnPrem to EXO, I am getting this error highlighted in yellow Do I need assign any role to synchronized user in Entra ID ? Currently, they are just MEU in EXO. When OAuth is test from EXO to OnPrem, I am getting this error Please advise.Microsoft Rushes High-Volume Email to General Availability
Almost two years after it first previewed, Microsoft is making the High-Volume Email (HVE) solution generally available in March 2026. HVE runs on a pay-as-you-go basis, but Microsoft won’t start charging tenants for sending email until May 2026. Two months should be enough for people to decide if they want to use HVE for internal communications as it has no ability to send external email. https://office365itpros.com/2026/03/09/hve-ga/Measuring KPIs like Response Times for Shared Mailboxes
Shared mailboxes are not CRM systems. However, many Microsoft 365 tenants use shared mailboxes to handle customer queries and then want to measure KPIs such as agent responsiveness to customer queries or the number of queries handled per agent in a month. As explored in this article, it’s possible to use the Microsoft Graph and PowerShell to extract some KPI-like data from shared mailboxes. https://office365itpros.com/2026/03/05/shared-mailbox-kpi/
Proper whitelisting of microsoft.com on dnswl.org
I keep having the issue that system-generated e-mails, e.g. on Trace Reports get classified as spam by the receiving e-mail provider. The sender address is email address removed for privacy reasons and the e-mails go to my M365 mailbox and are redirected to my external monitoring mailbox with that e-mail provider. The e-mail provider calculates a score that includes checking the sender's IP address 52.101.69.91 with dnswl.org . Unfortunately, that address is only whitelisted for outlook.com and some secondary domains, but not for microsoft.com. Of course, the issue also occurs with mailto:email address removed for privacy reasons and other IP addresses, so this is an example. It started to occur around two weeks ago, not sure if the provider changed policies or Microsoft changed the whitelisting; of course the provider refuses to overrun dnswl.org it, e.g. by own whitelisting. Who at Microsoft could I ask to fix that kind of issues? I don't find any appropriate category in their support menues, M365 support says the cannot help (TrackingID#2603031420001611). Thanks in advance for any hints, this is my first posting here, so please forgive me, if this is a dumb question.
Report for email reply time for shared mailbox
Hi All, i am looking to crate report for management for our KPI. Management want to to know how quick teams are replying to email once it's landed to mailbox. Also, average reply time for the particular mailbox for a day or week or month. if nay one know how to achieve this please let me know it will be grate help. Thanks, PreyashExchange online - track deleted mail
I am 365 admin and see quite often people rapport "all my mails are in deleted post - and I have done nothing" or similar What is the best practice to investigate that. I know in powershell I have made some auditsearches, where it rapports like softdelete, hardelete etc - but is there any more specific way proving that the user actually did in on his own ? - I know with retention policies it is hard delete - but just wondering what the best practice is like to prove to the user that this is the user. Just write that it is soft deleted and means user have done it, often the user think is not understandable
