Category: Exchange

February 14th, 2018 by Exchange
I'm publishing this article as a public service announcement since Microsoft is not warning customers in the Office 365 Service Health Dashboard. Beginning last week, we noticed that hybrid mailbox moves to Exchange Online started failing with a very high number of corrupt items, usually calendar items. The default limit for corrupt items is 10 in a hybrid mailbox migration. It's not unusual for some mailboxes have one or two corrupt mail items, usually calendar items, for mailboxes that have ...

Keep on reading: Warning - High number of corrupt items in hybrid migrations

Posted in Exchange

February 9th, 2018 by Exchange
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 meant for on-premises deployments in hybrid mode or what happens if you do business with customers whom use Office 365 as their collaboration platform. We would like to bring ...

Keep on reading: An Update on Office 365 Requiring TLS 1.2

Posted in Exchange

February 6th, 2018 by Exchange
In support you often have interesting cases come across your desk – and sometimes the questions and situations presented are odd.  On occasion you look at some of them and are like that’s impossible…and that’s what happened here. In this escalation, the customer was reporting that when they would remove a user from an Office 365 Group (Unified Group) and add a different user – the original user they removed would come back to group membership but the new user was not added. ...

Keep on reading: Office 365: Office 365 Groups and External / Guest Accounts

Posted in Exchange

February 6th, 2018 by Exchange
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 wanted to create the blog post series on the subject....

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

Posted in Exchange

February 6th, 2018 by Exchange
In Office 365 administrators may discover issues with distribution lists and distribution list membership.  In this article I wanted to walk through some of the common issues that I have seen and how we worked through them.  When working with distribution lists and distribution list membership we must review the locations where this information is stored.  The information in this post starts assumes distribution lists that are source on premises.  Any distribution list an...

Keep on reading: Office 365: Troubleshooting distribution lists and distribution list membership…

Posted in Exchange

January 30th, 2018 by Exchange
Today, we are announcing the availability of new functionality in Outlook for iOS and Android that simplifies the Exchange on-premises email account set up with Microsoft Intune and other enterprise mobility management (EMM) solutions.  ...

Keep on reading: Now your enterprise mobility management solution can be used to simply set up and configure Outlook for iOS and Android for Exchange on-premises

Posted in Exchange

January 26th, 2018 by Exchange
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 if they are using TLS protocol versions prior to TLS 1.2, and started to wonder how this may affect your on-premises deployments of Exchange Server. For clarity, this ...

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

Posted in Exchange

January 23rd, 2018 by Exchange
Last week, I chatted with MVPs Paul Robichaux, Alan Byrne, and Vasil Michev in the palatial surroundings of the Continental Hotel in Budapest, and Paul taped the conversation as episode #11 in our “Office 365 Exposed” series. You can listen to the recording on Paul’s website or iTunes (sometimes it takes a day or so before iTunes picks up new episodes)....

Keep on reading: Office 365 Exposed, Episode 11

Posted in Exchange

January 22nd, 2018 by Exchange
A while ago I created the “CollectLogsScript” (see my old A better way to collect logs from your Exchange servers blog post) which I have since rebranded to “ExchangeLogCollector”. Seeing that this has proven popular, I have continued to make some major improvements to the script over the years. The script was recently moved over to GitHub to allow people to know and understand what changes I have made so there are no surprises - those of you wanting to see the changes/commits in the...

Keep on reading: Exchange Log Collector Script

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January 18th, 2018 by Exchange
I've come across the following scenario in a number of migration projects. The customer creates a new tenant with or without AAD Connect with the intention of "kicking the tires" in Office 365. They create several cloud-only accounts and assign them licenses. Since these cloud-only accounts don't have an ExchangeGUID tying them back to on-prem Exchange, they are given a new mailbox in Exchange Online. Later, the customer decides to perform a hybrid migration of all or some mailboxes to EXO. AAD...

Keep on reading: Wash the "unclean". Fixing mailbox enabled cloud-only user accounts in Office 365 for hybrid migrations.

Posted in Exchange