Hey Microsoft Outlook users, we wanted to give you all a heads up! Unfortunately it was found out that the Microsoft Office suite (Word, Excel, Outlook and PowerPoint) has not had a seamless transition to the new OS for Macbooks, El Capitan. Apparently some users that have installed Microsoft Office 2011 and 2016 are having issues with the Microsoft suite crashing on them. And some that have been able to open the apps, have not been able to access their emails from Outlook at all.

Microsoft has released two statements regarding these issues, one to Computerworld recognizing the issue, “We know that some users may be experiencing issues with office 2016 for Mac running on El Capitan… We are actively investigating the matter with Apple. Until there is a fix, we recommend people install the latest updates to Office 2016 for Mac using Microsoft AutoUpdate.

Another Microsoft rep released a separate statement, “We know that some users of office 2016 for Mac are experiencing issues as a result of upgrading to Mac OS X 10.11 El Capitan. We are actively working with Apple towards a resolution.

Microsoft has been working to fix this glitch for the last couple days now, so hopefully soon we’ll see an update. That being said, if you notice a small dip in read and clickthrough rates from users with Outlook, this may be the reason.

In other news, Ars Technica found a security issue with the Outlook web application, as the server apparently is allowing a malware attack to sit on it and grab login credentials from various companies and organizations. The security company Cybereason was first to find the security flaw when a client noticed some strange activity on their network. Cybereason found that Microsoft’s Exchange Server was at fault, as malware was able to be placed on one of it’s components.

Cybereason explains, “Contrary to other web servers that typically have only a web interface, OWA is unique: it is a critical internal infrastructure that also faces the Internet. … This configuration of OWA created an ideal attack platform because the server was exposed both internally and externally. Moreover, because OWA authentication is based on domain credentials,whoever gains access to the OWA server becomes the owner of the entire organization’s domain credentials.

After Slate reached out to Microsoft, they replied, “For all types of critical servers and applications, we recommend IT administrators use the latest products and services, in combination with industry best practices for IT management.” This implies that if IT administrators have kept their systems up-to-date, this issue might not affect them, as it may already have been patched up.