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Is the Archive mailbox self-help diagnostic working for anyone?
Just curious: is the archive mailbox self-help diagnostic at https://aka.ms/PillarArchiveMailbox working for anyone? When I run it, instead of getting results about the user whose UPN I entered, I get this: The following issues were found with your archive mailbox. No account was found for [The UPN of my admin account]. Make sure you've entered the correct email address or create a new account with that name. For more information, see Add users to Office 365. I tried opening a ticket with Microsoft Support, but they refused to work on it without requiring me to do all the legwork of gathering logs and HAR traces and who knows what else, despite the fact that the support agent was able to replicate the exact same issue in his lab.
User cannot rename categories even when being the owner
Hi guys, I have a user that cannot rename categories in a mailbox whilst being the owner. As you can her permission level is set on owner. And yet the rename is greyed out: User says she was able to rename just some time ago, but when she tried on 17/04/2026 she couldn't. Anyone has any ideas?
Email Showing as Quarantined in a Message Trace, but Not Showing up in MS Defender
A customer of ours was waiting on an email to arrive and to help figure out where the email was or if it was sent yet we ran a message trace. The message trace showed that the email was sent to quarantine. With this information in mind, I went to MS Defender > Email & collaboration > Review > Quarantine but could not find the message. I modified some of the filters and could not get the quarantined message to appear. I triple checked the filters I created and made sure the information was correct. I also removed all filters and looked for the time period the email came in, but could not find it. Not sure if this is related, but this email had a significant delay likely coming from the sender. Any thoughts or ideas? Or anything that I am missing?Administratively retract a user's email
I was recently asked to retract a message that was sent in-error to staff. I ran a discovery/search, and saved it, but when I ran the powershell script after connecting to Exchange, the script could not find the search, something like name not found. I verfied the name was correct, and I am a global admin so permissions should not have been an issue. Does anyone know of any accurate documentation to run a search and retract? I had to use an old YouTube video and could not find anything in Microsoft's documentation.
ARC verification fail (40) on specific Exchange Online frontends - recurring issue
Hello, We are observing recurring arc=fail (40) errors on messages forwarded through Exchange Online, caused by specific frontend servers. The same messages pass ARC verification correctly on other providers (Google, etc.). Affected frontends identified so far: CH2PEPF0000013F.namprd02.prod.outlook.com - build 15.20.9700.17 (March 14, 2026) CH3PEPF0000000B.namprd04.prod.outlook.com - build 15.20.9769.17 (April 6, 2026) Both share the same build suffix .17. The signing implementation on our side has been cryptographically verified as correct and RFC 6376 compliant. The issue has also been reported on the IETF ietf-smtp mailing list with full technical analysis. Cryptographic analysis shows the failing servers append a spurious trailing \r\n to the last header before computing the verification hash, violating RFC 6376 Section 3.7. Is there a pattern with .17 frontend builds and ARC verification? Reagards Vittorio
Microsoft Exchange Report
I faced a new issue today, don't know if anything breaks at Microsoft or any new thing roll out from there, the things is unable to check usage report properly as well as unable to export the email activity, Mailbox Usage etc report under report- exchange and other tabs as well in customer tenant. I have Global Reader privilege but still facing this issue. Anyone faced this type of issue from today or before? If anyone knows about its pleas update your comment here. Thanks..iOS 26.4 iPhone Contact Sync with Microsoft Exchange Online
For the past 2–3 weeks, several of our iOS users have been experiencing synchronization issues with Exchange contacts. Contacts intermittently disappear from their devices and then re-sync after some time. In some cases, the re-synchronization process is significantly delayed. Anyone else experiencing the same issue?
Preserving permissions during EXO migration
Hi, Can you help me understand the outcome of preserving the permissions in our scenario. Exchange Server 2016 (soon Exchange SE) in a hybrid with Exchange Online. We are moving 75% of the mailboxes to Exchange Online. What ways will preserve or break the full-access or sendas permissions? I guess best way would be to migrate both the user and the shared mailbox at the same time in the same batch to keep the permission? If we migrate the user in batch 1 and shared mailbox in batch 2 will that preserve/break the full access/send as? If we migrate the shared mailbox in batch 1 and usermailbox in batch 2 will that preserve/break the full access/send as? If the permission is linked directly on the shared mailbox or via a security group is there a difference? Thanks!Microsoft Limits App Access to Sensitive Message Properties
Microsoft has announced details of a change to app permissions to restrict updates to sensitive message properties (like recipients) without consent for a new advanced mail access permission. If tenants have apps that interact with message properties, including apps developed by third parties, they should check whether the apps are updating sensitive properties. If so, the new permission must be assigned or the apps will stop working. https://office365itpros.com/2026/03/26/sensitive-message-properties-graph/
Can we hide default address lists in Outlook Address Book and show only custom ones?
There are existing Custom Address Lists. When users use the MS Outlook App (Office 2019) and open the Address Book, is it possible to hide the other address lists (including domain-sg-GAL, Global Address List, and domain-sg-Rooms), and only display the Custom Address Lists (domain-HK-AL and domain-sg-AL) — the ones shown in green in the photo?
