Critical security vulnerability in Outlook

Updates have been released for Outlook 2013 and Outlook 2016 to close two critical security vulnerabilities. With both vulnerabilities, it is possible to execute malicious code on the computer. With one of the vulnerabilities, it is sufficient to receive an email with a malicious attachment. The attachment does not even have to be opened. The corresponding CVEs can be found here: CVE-2018-0852 | ... Read more

Exchange 2016: Possible causes for requesting login information

From time to time I receive emails or inquiries about environments in which Outlook frequently or even permanently asks for login information. Some users and administrators even seem to have come to believe that Outlook's constant requests for user names and passwords are normal. The good news is that the permanent request for user and ... Read more

Outlook: DelegateWastebasketStyle, Shared Mailbox and a shared calendar

Sometimes you can't see the wood for the trees, in this case the following problem has led me onto the slippery slope. A user reports that although he can create items in a shared calendar of a colleague, he can no longer delete the entries. When trying to delete a calendar entry, Outlook only shows the following error message: The ... Read more

Exchange 2016: Comprehensive white paper on Autodiscover

Every day I receive emails from readers with questions and problems that are largely due to Autodiscover and/or incorrect certificates. This whitepaper is intended to help administrators understand and correctly configure Autodiscover, as it is an important part of Exchange Server without which the connection of Outlook and other devices would not work. The idea for ... Read more