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- André on Windows: Mysterious folder C:\Virus; Trend Micro involved?
- 45 RPM on Windows 11 24H2/Windows Server 2025: VM hangs after July 2025 update; fix with OOB update KB5064489
- Lutti on Windows 11 24H2/Server 2025 with huge Hyper-V bug?
- guenni on Microsoft Phishing with MS 365 tenants?
- Dave Fry on Microsoft Phishing with MS 365 tenants?
Recent Comments
- André on Windows: Mysterious folder C:\Virus; Trend Micro involved?
- 45 RPM on Windows 11 24H2/Windows Server 2025: VM hangs after July 2025 update; fix with OOB update KB5064489
- Lutti on Windows 11 24H2/Server 2025 with huge Hyper-V bug?
- guenni on Microsoft Phishing with MS 365 tenants?
- Dave Fry on Microsoft Phishing with MS 365 tenants?
Tag Archives: Outlook
Outlook Classic issue: Shows suddenly an "Add a service" popup and ask for credentials (June 2025)
[German]A blog reader told me about a strange problem in Microsoft Outlook Classic. Since June 13, 2025, Outlook shows a few minutes after start a dialog box "Add service" and disables the internet connection. It affects only single clients in … Continue reading
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Outlook crashes caused by June 2025 Updates confirmed with workaround
[German]The June 2025 security updates for Microsoft Office cause Microsoft Outlook Classic to crash in some versions. At the weekend, Microsoft confirmed these Outlook crashes and published a workaround. I'll put this information in a separate article. Advertising
Office-Updates June 2025: Outlook crashes, documents can't be opened
[German]The June 2025 security updates for Microsoft Office fixes critical vulnerabilities, but appear to cause serious problems for some users in corporate environments. Document files can no longer be opened in the Office applications. There are also reports of crashes … Continue reading
Posted in issue, Office, Security, Update
Tagged issue, Office, Outlook, Patchday 6.2025, Update
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New Outlook: And non explainable appointment cancellations in the calendar
[German]In addition to the issue just mentioned in the article Bug in Office 365 v2505? Mails are lost in cached mode, there is another inconsistency that a user has pointed out to me: Non explainable appointment or meeting cancellations in … Continue reading
Bug in Office 365 v2505? Mails are lost in cached mode
[German]I got reports from German readers who use Office version 2505 in a Click-2-Run version (e.g. Office 365). They are losing mails in Outlook 365 version 2505 when moving them to subfolders when cached mode is activated. Advertising
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 ...
Will Power Automate emails crashes Outlook 2019?
[German]A blog reader contacted me with a crude observation. In his customer environment, there is a case with Office 2019 in which emails sent by Power Automate cause the recipient's Outlook client to crash. Is this an isolated case or … Continue reading
Phishing with appointment invitations targets Office 365 accounts
[German]I'm pick up on a topic that is somehow already known in this form. Owners of Microsoft Office 365 accounts receive appointment invitations that claim that an action needs to be carried out. But in the background is a phisher … Continue reading
Microsoft confirms and fixes the Outlook login error [4usqa], CAA2000B and 49dvs
[German]Microsoft is not having a good run with its Outlook Classic for Windows and Mac at the moment. The company has just had to confirm logon errors that are being reported with the error code [4usqa] (or CAA2000B and 49dvs). … Continue reading
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Outlook fails with error [4usqa] since May 2025
[English]Redmond has probably deactivated its "Microsoft Information Protection API" in the tenants. As a result, Microsoft Outlook no longer works, but throws the error [4usqa]. Here is a brief overview of the situation. Advertising
Outlook: New requirements for bulk emails
[German]In future, Microsoft will specify new requirements for sending bulk emails in Outlook. For domains that send more than 5,000 emails per day, Outlook will soon require compliance with SPF, DKIM and DMARC. Non-compliant messages will initially be sent to … Continue reading