Welcome to the second in our post series on Lync connection tools. This week we’re talking about MOSDAL. Like TRIPP, it helps administrators figure out what’s gone wrong with Lync Online. And Exchange Online. And Office Web Apps. And a bunch of other Microsoft online services.

Let’s see what we’ll get from all this!

What Does MOSDAL Mean?

MOSDAL stands for “Microsoft Online Services Diagnostics and Logging”. It’s a support toolkit intended for diagnosing Office 365 and BPOS operational issues.

(I believe it’s pronounced ‘moz-dahl’. Had to think on that one.)

What MOSDAL Does

Microsoft’s description of MOSDAL:
“(MOSDAL) performs network diagnostics and collects system configuration, network configuration, and logging information for applications that are used to connect to Microsoft Business Productivity Online Standard Suite (BPOS-S) or to Microsoft Office 365. The logs and diagnostic information that the tool generates provide data that helps technical support professionals troubleshoot configuration, network, installation, and other service-related issues.”

Though they deal with the same arena – Office 365 services like Lync Online – MOSDAL has a much broader focus than TRIPP.


A detailed list of which services MOSDAL covers, and what information it compiles, is here:
The Microsoft Online Services Diagnostics and Logging (MOSDAL) Support Toolkit – Microsoft Support

Essentially, it runs a series of tests on the service you request, hands you the test results and says, “The problem’s in here someplace. Good luck.”

What Kind of Information MOSDAL Gives You

Once you’ve selected a service to test, entered your login & password (not required every time) and hit Run, MOSDAL will take a few moments to conduct its tests.

When done, you’ll receive reports in the form of text files grouped in folders. I ran a test on my Active Directory connection as an example. (I don’t use Office 365 on this machine, but I do have a live Active Directory connection!)

The folders are:

  1. Admin_Applications
  2. Network_Tests
  3. System_Information
  4. User_Applications

Each has subfolders and sub-subfolders, to identify specifically what the text file they (eventually) contain talks about.

The end result is a large group of text files with huge amounts of system & network data in them. Being plain text, it’s easy to search through them for whatever issue you’re having with your Lync Online or DNS setup.

However, the sheer number of files & folders is frustrating. There’s no overview report, no callout of a big issue…nothing like that. MOSDAL creates an information dump. Which may not be what you want when you’re scrambling to find & fix a single issue.

For instance, here’s the sum total of the “O365_Sign_In_Assistant” log file:

Starting MSO IDCRL Sign-In Assistant Configuration Data
Microsoft Online Services IDCRL Not Installed – No registry key
Completed MSO IDCRL Sign-In Assistant Configuration Data
Module Execution Time was: 0 minutes and 0 seconds.

This file was 3 folders down.

MOSDAL is a very useful tool for collecting diagnostic information. Its only caveat is that it leaves sifting through all that information up to the administrator.

Where to Find MOSDAL

The support toolkit is a free download:
Download MOSDAL Support Toolkit

You’ll need the .NET Framework 4 to run it. But you already had that, right?

NOTE: You’ll also find a training file at the URL above. I suggest downloading it as well – it has some useful reference points for where MOSDAL stores data, and a couple ways to make sense of it all.

Coming up we’ll have a post on either:

  • Online Directory Synchronization
  • OCSUMUtil

Have you used MOSDAL before? What for? And did you find the information you needed to resolve the issue?

Examining Lync's Connection Tools: MOSDAL
Tagged on:                 

2 thoughts on “Examining Lync's Connection Tools: MOSDAL

  • April 30, 2015 at 6:49 am

    The link to download MOSDAL is no longer available, is there any other location to download MOSDAL?

    • May 6, 2015 at 10:17 am


      Thanks for the comment. It seems Microsoft has removed MOSDAL and has not announced a replacement yet. I’ll keep an eye out in case they do.


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.