An Update on Office 365 Requiring TLS 1.2

Hello Exchange Server followers! In December 2017 it was announced Office 365 planned to discontinue support for TLS 1.0 and TLS 1.1 connections on March 1st, 2018, and after that time only TLS 1.2 connections would be allowed when interacting with Office 365. Many of you have been asking for additional detail on what this…


Demystifying Hybrid Free/Busy: what are the moving parts?

Hybrid Free/Busy is one of those things that many people do not fully understand. If everything works well, the complexity is hidden from view and people working in various parts of organization can seamlessly work together. But if things go wrong… you will appreciate deeper understanding of what makes it work. This is why we…


Exchange Server TLS guidance, part 1: Getting Ready for TLS 1.2

Overview As the realm of security in technology continues to evolve over time, every so often we say hello to newer and more competent versions of technologies while saying goodbye to their older siblings. By the time you are reading this article you may have learned Office 365 intends to stop accepting inbound network connections…


Released: December 2017 Quarterly Exchange Updates

Update: Microsoft has identified a condition where Free/Busy lookups from On-Premises to O365 in a hybrid configuration may fail. Please see KB4058297 for additional information and mechanisms to resolve this condition. The December quarterly release updates for Exchange Server are now available on the download center (links below). In addition to the planned cumulative updates…


Announcing availability of 250,000 public folder Exchange 2010 hierarchy migrations to Exchange Online

Last September, we announced a beta program to validate onboarding of public folder data from Exchange 2010 on-premises to Exchange Online with large public folder hierarchies (100K – 250K public folders). We are glad to announce that Exchange Online now officially supports public folder hierarchies of up to 250K public folders in the cloud –…


2nd call for public folders to O365 Groups migrations

Update: this beta program is now closed; please see this for the feature availability announcement. We got some replies to our previous post on the subject, but wanted to reach out again as we want to make sure we validate this scenario well. Therefore, here is an updated request: If you are using Public Folders…


Released: March 2017 Quarterly Exchange Updates

With this month’s quarterly release we bid a fond farewell to Exchange Server 2007. Support for Exchange Server 2007 expires on 4/11/2017. Update Rollup 23 for Service Pack 3 will be the last update rollup released for the Exchange Server 2007 product. Today we are also releasing the latest set of Cumulative Updates for Exchange…


Analyzing Exchange Transaction Log Generation Statistics – Revisited

Almost 4 years ago, I wrote a script called GetTransactionLogStats.ps1, and originally blogged about it here. At the original time of writing, the primary purpose of the script was to collect transaction log generation data, and use that to determine the percentage of transaction logs generated per hour in an environment. This could in turn…


Released: December 2016 Quarterly Exchange Updates

Today we are announcing the latest set of Cumulative Updates for Exchange Server 2016 and Exchange Server 2013. These releases include fixes to customer reported issues and updated functionality. Exchange Server 2016 Cumulative Update 4 and Exchange Server 2013 Cumulative Update 15 are available on the Microsoft Download Center. Update Rollup 22 for Exchange Server…