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Tag Archives: Exchange Online
Microsoft Outlook (2019, 2021, 365): Unable to connect to Exchange Online mailboxes
[German]A quick question for users and administrators who are still using Microsoft Outlook 2019 (support for Office 2019 expired in October 2025). I've received a report that it's currently no longer possible to connect to Exchange Online mailboxes. There have … Continue reading
Exchange Online: Permission change on "Public Folders" is denied
[German]A question for all Exchange Online tenant administrators. Are you currently still able to set or change permissions for public folders? A blog reader contacted me because he's been having trouble with his tenant for the past few days—he can't … Continue reading
Identify EWS apps and their use prior to EWS shutdown
Microsoft is retiring Exchange Web Services (EWS). This process will begin in October 2026 and end with the complete shutdown of EWS in 2027. I recently mentioned this in the German blog post Exchange Online: Zeitplan für das Ende von … Continue reading
Exchange Online: Auto-Archiving Rollout in October 2025 – delayed
[German]Auto-archiving for Exchange Online will be introduced worldwide for all public clouds in October 2025 and for all government clouds in November. Once archiving is enabled for Exchange Online users, the oldest items will be automatically moved from a user's … Continue reading
Microsoft 365: Outage blocks Teams and Exchange Online (Oct. 8, 2025)
[German]Yesterday noon / evening (Central European Time), October 8, 2025, there was a disruption to Microsoft 365 services. This resulted in users experiencing problems accessing Microsoft Teams and Exchange Online features. As the disruption occurred late in the evening, users … Continue reading
Why ISL Online: Critical factors when choosing a remote desktop solution
[Sponsored Post]In the rapidly evolving IT world, choosing the right remote desktop software is critical for organizations that value security, ease of use and reliability. One provider of secure remote access that has been on the market since 2001 is ISL Online, which presents some considerations for choosing such software below. More ...
Microsoft confirms Outlook 365 bug that can only be fixed by support
[German]Microsoft has confirmed in a support article that there is a bug in Outlook 365 that can cause crashes when starting up. If I understand correctly, intervention by Microsoft Exchange Online Support is required to fix this bug. And there … Continue reading
Anti-spam service blocks links in Exchange Online and Teams
[German]Since Friday, September 5, 2025, users of Exchange Online and Microsoft Teams have noticed that links can no longer be opened. The cause is Microsoft's anti-spam service, which blocks these links for individual users and even moves emails into quarantine. … Continue reading
Replacing Exchange with cloud-managed remote mailboxes in EO
[German]Microsoft unveiled its "Cloud-Managed Remote Mailboxes" on August 20, 2025. This is an attempt to free companies that have moved all their mailboxes to Exchange Online in the cloud from the Microsoft Exchange servers they still operate on-premises. These Exchange … Continue reading
Exchange Online: 12-hour sync issue (EX1137017) is being investigated
[German]Microsoft is investigating an issue with Exchange Online that causes emails to not sync with Outlook for 12 hours. This affects users of mobile devices where the Outlook client uses Hybrid Modern Authentication (HMA). Email access issues may then occur … Continue reading
Reduced license count for the Exchange Online Delicensing Resiliency feature
[German]Microsoft has slightly adjusted its criteria for delicensing resiliency for Exchange Online tenants. Now Exchange Online tenants with fewer than 10,000 licenses can also benefit from this function. This helps administrators who remove licenses in a tenant to prevent the … Continue reading