Improving How Outlook Classic Handles Reactions
A fix due in May 2026 will make sure that the Outlook classic client will handle Outlook reactions properly if the reactions are blocked. Of course, if tenants don’t like responding to email with an emoji, they can create a transport rule to insert the x-ms-reactions header. Detecting the header is an instruction to Outlook clients to suppress reactions that Outlook classic has been ignoring up to now. https://office365itpros.com/2026/04/17/outlook-reactions-classic/
Mailbox for Service Account (exchange online)
Hi Our organisation isn't ready to move to Exchange Online yet, though we have Office 365 e3 licencing. I need to create a service account that can send emails via Outlook 365 for use In Power Automate. The documentation I have seen for adding a mailbox to an existing AAD user requires assigning an exchange licence to the account via the licence portal. I can't see any such licences though we do have e3 licencing which are visible that I assume covers this? Unfortunately the admin who did the original configuration has moved on and I don't have a global admin role so have to go through a support team that can't help me with my lack of knowledge in the area! Any advice would be very much appreciated as what ( i think) should be a simple task has taken a lot of time to try and get to the bottom of! Thanks, Dale.
How do I stop Copilot from adding to my Outlook?
I'm using Outlook Classic, and every day Copilot adds itself to my Outlook. I right-click and select uninstall, but the next day it comes right back. I do not want Copilot. How do I stop Copilot from adding to my Outlook. I've included screenshots to see what I'm talking about. Version: Microsoft® Outlook® for Microsoft 365 MSO (Version 2504 Build 16.0.18730.20122) 64-bit
Last week my office changed color to blue and i spoted opening pdf files
Last week my office changed color to blue and i spoted opening pdf files. when i try to open a pdf file says "Error and to try again later in a few moments" The Outlook online say the same thing. On my phone i can see the pdf fine. I tryied to repair the outlook, but didnt work.
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
Outlook 2016 blank MFA screen for some users
I have a Conditional Access rule so that when someone connects from outside a trusted IP it requires MFA, I have a few users that get the "Requires password" message come up, they get a window and type in their username and click next, then the window disappears without prompting for MFA and it's back to where they were. Same thing if they go to File->Accounts if they are signed out and try to sign in they get asked for Email and then it just closes and they are still signed out. It's not for all users and everyone is using the same Office 365/2016 installation, monthly channel 1903, we use ADFSOffice 365 no internet error
Outlook just stopped working yesterday. I have been using 356 for a couple of years now. One drive and Outlook both say I don't have internet access. Obviously I do. I can use one drive and outlook via a web browser, but not the desktop apps. I have tried most of the suggested fixes and nothing has worked. Anyone else having issues?Office 365 issues
We have an end user that started with us approximately a year ago. Shortly after he started he began noticing that his status would go away on a fairly regular basis on MS Teams. We tried uninstall/reinstall, resetting, repairing and the problem persisted. Since he was a relatively new hire we were thinking it was something with his laptop so we replaced and the issue returned. Turned in a ticket with our Office 365 vendor who in turn opened a ticket with Microsoft. After some initial testing they sent a Teams install file that seemed to fix the issue. Since that time he has regularly had issues with Teams disconnecting, Outlook just stop receiving emails, while showing connected. Typically the only fix was a restart and on some occasions that did not work. Sometimes a reset or repair might fix this issue. Throughout this we did clear credential manager, caches, etc...This got a point yesterday where I created a new user profile for him, basically like a new laptop and it temporarily fixed the Teams and Outlook issue, however when attempting to sign into MS Edge it would just spin and had to use task manager to close the app. Tried a repair on the app as you cannot uninstall and same result it would hang up and have to forcibly closed. Just wondering if someone else has encountered something like this and possible fixes. Thanks
