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Outlook with MDaemon Connector hanging, crashing, freezing

[Wyatt, Martin]
Martin Wyatt
Posts: 19
Martin Wyatt - 11:23am, Jun 14 2019

My users are ready to revolt and I'm dumbfounded, so I'm seeking suggestions or experiences you've had.

I have 400 users. Of those, 100 use Outlook 2013 with MDaemon Connector. A few months ago we migrated from Office 365 to MDaemon. Of course, Outlook worked flawlessly with Office 365, but even with new Outlook profiles and MD Connector we have problems with most of those users experiencing hanging/freezing of Outlook. Often during email creation, especially when an attachment has already been added, but other times when Outlook is sitting idle. The app just goes gray saying "Outlook not responding" and after several minutes it may recover, other times hangs indefinitely requiring us to End Task, and other times Outlook crashes and states it has crashed and will restart.

Occurs on Outlook 2013, 2016 and 2019.

It's odd because it's intermittent and inconsistent for each user. Sometimes one will experience it 10-12 times hanging/freezing/crashing during a single day and then smooth sailing for days. Others get the hanging/freezing/crashing once a day, but that's about it.

I've blocked realtime antivirus access to the Alt-N folder
I've uninstalled antivirus, only using Windows 10's Windows Defender
I've done Office repair
I've completely uninstalled, including cleansing to remove Office remnants, and reinstalled
I've tried different versions of Connector, including beta
I've changed MDC folders settings to Load PIM and IMAP synchronously
I've set Send/Receive to only check Inbox
I've set compact database on Outlook shutdown
I've removed all add-ins except Connector

None of this has helped.

Here are some stats about two Outlook clients that frequently freeze:
- His Local cache is 404,416 KB and Attachments folder = 10,415 items and 2.75GB in size
- My own Local Cache is 417,812 KB and Attachments folder = 466 items and 46 MB in size

The first one experiences hanging/freezing/crashing constantly, whereas I only get it once a day or overy other day.

Is the Attachments Folder item quantity and/or size a culprit?

I know you may be thinking "Wow you have too much email, that's why it's freezing!" I accept that for some of our users with 24,000 emails in their inbox. That's definitely too much email. But this is also happening to users with only a few hundred emails sprinkled throughout various Outlook folders. So the "too much email" excuse is anecdotal and not applicable in our situation. Consider this - one user that successfully housed 45GB of email in their Outlook OST file with Office 365 with no hanging/freezing/crashing is currently experiencing hanging/freezing/crashing with only 12GB of email.

In our case the Outlook OST database file appears a superior solution compared with MDaemon Connector. But OST is obviously not a solution for us, we're committed to MDaemon. And I love the product. But I also have many impatient Outlook users who need calendar integration. So I really do welcome other suggestions.

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Martin Wyatt - Apr 21, 2021 4:50 pm (#20 Total: 28)  


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Martin Wyatt
Posts: 19
Replying to: Tony Burtovoy (Apr 8, 2021 8:50 am)
We see it here too, and also have seen it randomly over the years with several OC versions. Currently...

I agree with you, I've set up brand new Windows 10 install from scratch, new Office 2019 install, most recent MDaemon Connector version, and within days the user will experience some form of hanging/crashing/freezing. I hadn't thought about calendars possibly causing the issue. Typically I do NOT archive calendar items because it wipes out the calendar history the users enjoy from their mobile device.

Still yours sounds eerily similar to my experience when the account attempts to send/receive (or sync, whatever) and it chokes on something that the MDaemon Connector or IMAP is doing in the background.

It would be sad for our users to also lose their calendar history in addition to their emails. I have it pretty tight as it is, forcing archival of anything older 6 weeks.

Martin Wyatt - Apr 21, 2021 4:55 pm (#21 Total: 28)  


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Martin Wyatt
Posts: 19
Replying to: Tony Burtovoy (Apr 20, 2021 7:36 am)
My most recent Outlook setting that I am focusing on is 'Autosave'. I have seen some improved performance (significantly...

I will try disabling Outlook autosave and give it a few weeks to see if there is improvement. I've seen no improvement to my situation with updates/patches for Microsoft Office.

Some of our users signatures have inline images that link to an external source on our server. Others embed a png or jpg into the signature. I haven't seen any correlation between our issues and signature content. For example, my signature is simple text and I experience the same hanging problems as others with complex signatures.

Tony Burtovoy - Apr 22, 2021 6:50 am (#22 Total: 28)  


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Tony Burtovoy
Posts: 188
In working with another user just moments ago, he (like most others) had a signature with complex formatting, including an inline image.

I deleted the inline image and re-saved the signature.. then the issue which was easily reproducible did not re-occur. When I put the inline image back into the signature, the issue also did not re-occur (at least not yet).

It's almost as if the signature (in %appdata%\Roaming\Microsoft\Signatures) had somehow become slightly corrupt and the act of removing the inline image, saving, then re-adding it, somehow overwrote whatever was corrupted. ??????????

I suppose that if signatures.. or sigs with inline-images are part of the problem here, then ANY of the following would prove helpful in different scenarios:

1. Turn off autosave, which likely adds a signature to a draft during a "save"

2. Turn off signatures
3. Remove inline-images from signatures
4. Remove inline-images, save, the re-add inline images
5. Reduce complex formatting in signatures

For the time being, I'm ensuring that all Windows updates and Office updates are in place.. and asking my users to do different things with turning off Autosave, or signatures, or signatures with images....... to see which is most applicable.


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