I’m sure that a lot of people have seen this issue before when migrating to Exchange Online:
The BadItemLimit was exceeded and therefore the move request failed.
A while a go Ben Winzenz wrote an excellent post on the You Had Me At EHLO blog, where he mentioned that there was a change in Exchange Online and now failed mapping of SIDs will count towards the BadItemLimit.
So far so good, but how do we solve such issues when increasing of bad item limit is not an option and you have to migrate approx. 130.000 mailboxes?
I spent last weeks quite some time with Outlook performance issues in an Exchange Hybrid scenario. In addition this is not a normal Hybrid as here multiple Exchange Organizations from different AD Forests without any Trust Relationships are involved.
Thus I’m not talking about the scenario described in TechNet Multi-forest hybrid deployment scenario. It looks more like this:
When you read the headline, you’re might thinking “Oh no! Another post about this topic!”. But I think this post is worth reading as I’ll go deep into details.
Over the last months I have seen an increase of questions from various teammates and other teams in regards of the Exchange Online Remote PowerShell Module. The questions where mostly related to connectivity issue and prompts for re-authentication as PSSessions got into a broken state.
Also the fact that in some areas a proxy needs to be used, might be confusing as well as the question what to do if you have a service account or want to use the module in ISE.
This post was lingering around for a long time, but the last weeks showed me it’s time.
Actually I came across this topic last year just before Ignite. But somehow this topic felt into oblivion. To make it short:
It’s all about the number of TCP connections an Outlook Client establishes in a Cached Mode. Especially when it comes to shared mailbox or delegate scenarios.
What is Outlook Cached Mode?
Read more about it here. But what you really want to avoid it something like this:
A long time ago Jim Martin wrote an excellent article how Exchange maps folder IDs for ActiveSync:
MVP Glen Scales wrote a script, which uses Exchange Web Service, to query a mailbox and export the information into a CSV file. Glen’s post could be found here.
Lately I had to troubleshoot Exchange ActiveSync devices and had also the need of mapping IDs to folder as the IIS logs contain only the folder IDs. Glen’s script was doing a good job, but wasn’t too user-friendly. Therefore I improved the usability and extended the ability of gathering data.
With this I was able to easily troubleshoot my devices by parsing the IIS logs with my script Get-IISStats.ps1 and the new one: Get-EASFolderMapping.ps1
In my Ignite session with fellow MVP Andrew Higginbotham Troubleshooting Complex Exchange operational issues, I mentioned Fiddler as a perfect tool for troubleshooting also Exchange ActiveSync clients as well as Exchange servers itself.
After this session a lot of people reached out to me and asked me about how to do this. So I thought a write-up would be a good idea.
A while ago I wrote a post about Troubleshooting calendar items. Since then our capabilities improved as Microsoft added more functionality to Cmdlets and I enhanced also my own script (description can be found here).
The intention of this post is to give you a deep dive of advanced troubleshooting similar to my Get-ExchangeDiagnosticInfo post.
The content is as follows: