Microsoft Sign In Loop
I am trying to sing into Microsoft 365, but every time I do, it takes me back to the login screen. I sing in with my outlook account, but I can't reach the applications. I can sign in on the browser, but not the applications on my computer. I have tried uninstalling and reinstalling M365, but the issue still persists
M365 Admin Center Global Administrator Lockout
Hello Microsoft Community, I am seeking urgent assistance and guidance regarding a critical Microsoft 365 tenant lockout that has been ongoing for several days without a resolution or proper communication from the support team. Our organization manages Microsoft 365 services for a business with more than 200 active users who depend on Microsoft 365 for their daily operations. Issue Description We have been locked out of our Microsoft 365 tenant's administrator account. This prevents us from properly managing our Microsoft 365 environment and restoring normal access to essential business services. Our business-critical data, including important documents and operational information, is stored in SharePoint. The inability to access and manage these services has significantly disrupted our business operations. Microsoft Support Ticket References We have raised multiple support tickets and followed up repeatedly, but the issue remains unresolved. Tracking ID: 2610050040001149 Tracking ID: 2610090010001066 Tracking ID: 2610050040001222 Despite these support cases and repeated follow-ups, we have not received a satisfactory resolution or a clear recovery timeline. Support Experience So Far Following a discussion with the support team, we were expecting a call to assist with unlocking the administrator account and providing a temporary password through the appropriate recovery process. However, we have not received the expected call or a meaningful update. Our main concerns are: Complete loss of access to the Microsoft 365 tenant administrator account. More than 200 users affected by the ongoing incident. Critical business data and documents stored in SharePoint. Multiple support tickets without a concrete resolution. Lack of clear communication regarding the root cause and recovery timeline. No clear escalation path or confirmation of the next recovery steps. Our Concerns We understand that technical issues can occur, but leaving a business-critical environment inaccessible for an extended period without meaningful updates is extremely concerning. We purchase Microsoft 365 licenses through a partner and expect appropriate technical support and escalation assistance when critical incidents occur. Our organization previously used Google Workspace and recommended migrating to Microsoft 365 because of its enterprise capabilities. This incident has seriously affected user confidence and business continuity. If access cannot be restored promptly, we may have to consider alternative email hosting arrangements to minimize further disruption. Request for Assistance I would appreciate guidance from Microsoft engineers, Microsoft 365 administrators, and community members who have experienced similar situations. What is the appropriate escalation process when all available tenant administrator accounts are inaccessible? How can we expedite tenant ownership verification and administrator account recovery? Is there a dedicated Microsoft team that handles critical tenant lockout incidents affecting business operations? What is the recommended recovery process when the administrator cannot access the Microsoft 365 Admin Center? How can we obtain urgent assistance when multiple support tickets and repeated follow-ups have not resulted in a clear resolution? Can the three referenced support tickets be escalated for urgent review by the appropriate Microsoft support team? We are not looking for workarounds that compromise tenant security. We need Microsoft's official recovery process to restore authorized administrative access safely. Microsoft Support Team: If any Microsoft support representatives are monitoring this community, we would appreciate your guidance on the appropriate escalation channel for this incident. We can provide additional information privately through the appropriate official channels. Thank you for your time and assistance. Any guidance that helps us restore our services and protect business continuity would be greatly appreciated. Best regards, Microsoft 365 Tenant AdministratorCan Microsoft 365 Copilot Access Archive Mailboxes?
After writing about the new 100GB mailbox quota for Microsoft 365 Business Tenants, I was asked if Microsoft 365 Copilot supports Exchange Online archive mailboxes. It does. Microsoft Search indexes items in archive mailboxes, so Copilot can find and use items from those mailboxes. Interestingly, the DLP policy to block external email for Copilot didn’t work. That’s definitely something to investigate! https://office365itpros.com/2026/10/08/archive-mailbox-copilot/Using the Exchange Import-Export Graph API to Access Group Mailboxes
After saying that the Graph didn’t offer much support for group mailboxes, I was promptly countered with an article explaining how to use the Exchange Import-Export API to access folders and items in group mailboxes that wasn’t limited to just the Inbox. Well, the good news is that the approach works, as seen in a complete script written to prove the case, but whether I would ever use this API for a purpose it was never designed for is quite another matter. https://office365itpros.com/2026/10/07/group-mailbox-folder-items/MS Outlook 2024 LTSC automatically gets closed and later not getting open
In Outlook 2024 LTSC, the application suddenly stops and closed automatically. Later troubleshooting, it is observed that it doesn't even open in safe mode. Tried to create a new profile where it is not able to search the user from exchange and automatically redirect to Microsoft 365 login page whereas our mail server works in exchange mode. Even after reinstalling the MS office 2024, it is not able to search the user and redirects to Microsoft 365 login page. What is the issue and resolution.
Unable to Open an Old OST File After Outlook Profile or Mailbox Changes
Hi everyone, I am looking for suggestions on handling an old OST file where the original Outlook profile or mailbox is no longer available. The situation is that an OST file contains important mailbox data, but Outlook cannot open it normally after changes to the user account or profile. This can happen after a Microsoft 365 mailbox change, Exchange migration, user account removal, or when an OST file becomes damaged. Since OST files are linked to the Outlook profile and mailbox that created them, simply moving the file to another system does not always make the data accessible. Before attempting any recovery approach, I would like to understand the recommended steps: Is there any Microsoft-recommended method to access an orphaned OST file? What checks should be performed before trying to recover data from the OST? How do administrators usually handle old OST files when the original mailbox is no longer available? What is the best way to validate recovered mailbox data? I would appreciate feedback from anyone who has handled similar Outlook OST recovery scenarios after Microsoft 365 or Exchange changes.How to Recover Data from a Damaged or Corrupted OST File When Outlook Cannot Open It
Hi everyone, I have seen several cases where users still have an old OST file but cannot access the mailbox data inside it. This usually happens after an Outlook profile is removed, a Microsoft 365 or Exchange account is changed, a mailbox is no longer available, or the OST file becomes damaged or corrupted. One common misunderstanding is that an OST file can be opened on another computer in the same way as a PST file. However, an OST file is linked to the Outlook profile and mailbox that created it. If that connection is no longer available, Outlook may not be able to open the file normally. Before trying to recover the OST data, it is worth checking a few things: Is the original Microsoft 365 or Exchange mailbox still available? Can the Outlook profile be recreated and synchronized again? Is the issue related to the OST file itself or only the Outlook profile? Do you need the complete mailbox data or only specific folders/items? If the mailbox is still available, rebuilding the Outlook profile and allowing Outlook to create a new OST may be the better approach. However, if the mailbox no longer exists, the Outlook profile has been deleted, or the OST file is damaged and contains the only available copy of the mailbox data, recovery becomes a different process. In these situations, it is important to first check what information is still readable from the OST file. Scanning and previewing the mailbox data before export can help identify available folders, emails, attachments, contacts, and calendar items before creating a new PST file. A practical OST recovery workflow usually involves: Keeping a copy of the original OST file before making any changes. Checking whether the original mailbox can still be synchronized. Scanning the OST file to identify available mailbox items. Reviewing important folders and messages. Exporting the required data to PST. Validating the resulting PST in Outlook. A detailed overview of the OST to PST conversion process, including scanning, previewing, selecting mailbox items, and exporting recoverable data, is available here: https://www.edbmails.com/pages/ost-to-pst-converter.html One important point to remember is that recovery results depend on the condition and readability of the OST file. A conversion tool can help extract available mailbox information, but it cannot recreate data that is no longer present or readable inside the source file.
New Outlook - PST file cannot reopen and PST search not working
Hi, Issue 1 – One PST file cannot be reopened I have two PST files, PST A and PST B. PST A can currently be opened and browsed normally in New Outlook. PST B was previously opened in New Outlook and I was able to browse the folders and emails. However, after I closed/removed PST B from New Outlook, I am now unable to open/add the same PST file again. The PST file can still be opened using Classic Outlook. If the PST format is unsupported or too old for New Outlook, why was New Outlook able to open and browse it previously before I closed it? Could this be related to the PST format (ANSI vs Unicode), PST corruption, or a limitation/bug in New Outlook? Issue 2 – Unable to search emails stored in PST For PST A, I can open the PST and manually browse and read the emails in New Outlook. However, when I use Search, emails stored inside the PST do not appear in the search results. This is referring to searching for the email/message itself, not searching for attachments. The same PST can be searched using Classic Outlook. My understanding is that New Outlook now supports searching emails stored in PST files. Is PST search fully supported, or are there still limitations compared with Classic Outlook? I would appreciate any advice on how to troubleshoot both issues, especially whether there is a way to verify PST compatibility with New Outlook.
Intermittent “We can’t retrieve the calendar events right now” error in Outlook team calendars
We are receiving an increasing number of reports from users who are unable to view colleagues’ calendars in Outlook. The following error is displayed: “We can’t retrieve the calendar events right now. Wait a few minutes and try again.” The issue appears to be intermittent and inconsistent across Outlook clients: Some calendars work in Outlook on the web but not in New Outlook or Classic Outlook. Other calendars fail in OWA as well. A calendar may work temporarily and then fail again after restarting Outlook or switching between New and Classic Outlook. Some users first experienced the issue yesterday, while others have experienced it for more than a week. One affected user is a manager with nine direct reports. Outlook automatically displays these users under “Team: [Manager name]”. However, the number of visible team members changes after restarting Outlook or switching clients. For example, the group may contain all nine members at one point and only three at another. The Manager attribute and reporting structure have been verified in Active Directory/Entra ID and are correct for all team members. Our Service Desk has already tested the following without resolving the issue: -Outlook on the web, New Outlook and Classic Outlook -Removing and adding the affected calendars again -Adding calendars manually using the users’ primary SMTP addresses -Resetting the Outlook navigation pane -Resetting Outlook views -Creating a new Outlook profile -Verifying the users’ Manager attributes and reporting structure Because the issue also occurs intermittently in OWA and the membership of the automatically generated Manager’s Team Calendar changes, this does not appear to be limited to the local Outlook profile. Has anyone else experienced this recently? Could this be a known Exchange Online issue involving the automatically generated Manager’s Team Calendar, shared-calendar synchronization or mailbox-side calendar navigation data? Are there any additional diagnostics or supported methods for rebuilding the Manager’s Team Calendar configuration in Exchange Online?
