The Office 365 Hybrid Configuration Wizard uses the ClickOnce as deployment technology. While this is great, there are a lot of problems. For example, the ClickOnce application is not launching, or the ClickOnce application cannot be started error. While this…
Microsoft released several Security Updates (SUs) for Microsoft Exchange Server to address vulnerabilities. Due to the critical nature of these vulnerabilities, we recommend that customers apply the updates to affected systems immediately to protect the environment. Note: These vulnerabilities affect…
Right now, there is an Exchange Classic Hybrid Topology configured, and we want to configure Exchange Modern Hybrid Topology. In this article, you will learn how to switch from Exchange Classic Hybrid Topology to Exchange Modern Hybrid Topology. Table of…
Security researchers from GTSC Network Security firm have found a new zero-day vulnerability in Microsoft Exchange Server 2013/2016/2019, which is exploited in the wild. According to the GTSC report, at the beginning of August 2022, they discovered a critical infrastructure…
Port 25 is the default port for incoming and outgoing mail flow. But, it doesn't mean you need to allow port 25 for incoming and outgoing mail to everyone (all). Instead, Exchange Server port 25 should be only accessible from…
You have an Exchange Hybrid configuration and want to migrate a mailbox from Exchange Online to Exchange on-premises. Only this time, you get the error Cannot find a recipient that has mailbox GUID. In this article, you will learn why…
We recommend enabling TLS 1.2 on Exchange Server 2013/2016/2019 and disabling TLS 1.0, TLS 1.1, and TLS 1.3. Even though TLS 1.3 is newer, you should disable it. That's because TLS 1.3 is not supported for Exchange Server and causes…
Microsoft released several Security Updates (SUs) for Microsoft Exchange Server to address vulnerabilities. Due to the critical nature of these vulnerabilities, we recommend that customers apply the updates to affected systems immediately to protect the environment. Note: These vulnerabilities affect…
The SpamBull cloud spam filter has a 7-day trial for everyone! So start a 7-day free trial to access all the features without spending a cent. This is great news for everyone managing and protecting the organizations from attacks. SpamBull…
Your Exchange Server 2016/2019 is up to date with the latest Exchange Cumulative Update and Security Update. But when you check the Exchange Server health, it shows a security vulnerability is detected: Download Domains are not configured. This article will…