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BR0KK avatar image
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BR0KK asked LucasLiu-MSFT commented

Exchange Online + Office 365

Hi,

one of my cutomers has rented exchange online with O365. He has Problems with his email accounts.

He has configured those mail accounts on many different systems.
3 PCs and a few mobile devices.

Its 3 PCs with 3 mailboxes and 3 Phones/iPads. Each of them has all three mailboxes configured

Now Outlook on some clients can not access the mailbox and displays a waring that the connection could not be established.

I assume that MS has a hardcoded connection limit inside their exchange?

I can not get a hold of support by telefon...

So how do i fix this now?

Update:

This is one of the messages i get trying to sync the mailbox:
93535-probleme.png

If i try to open the mailbox within outlook i get a message that the mailbox can not be opened becuase there is no premission to open it
Sometimes this works tho ...

I'll collect another screenshot of this when i speak with my customer

thx


office-exchange-server-connectivity
probleme.png (107.3 KiB)
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GianlucaMelis avatar image
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GianlucaMelis answered

you have to narrow down the problem a bit more. The given information is way to general for anyone to be able to help you.
when you talk about exchange online with 365 i would assume you have a standard M365 E3 Licence, If that's the case you may use Office simultaneously on 5 devices (3 PCS and "a few" phones is more or less than 3 phones?)
more infos here https://support.microsoft.com/en-us/office/how-sign-in-works-in-microsoft-365-1d646e83-1585-4278-8daf-d4a2cc0905e0#:~:text=With%20Microsoft%20365%2C%20you%20can,Macs%2C%20tablets%2C%20and%20phones.

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AlexC-8264 avatar image
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AlexC-8264 answered

Hi BR0KK,
Have you already found this KBA and tested?
Error 0x8004010F when you try to send or receive email in Outlook 2010 or Outlook 2013
https://docs.microsoft.com/en-us/outlook/troubleshoot/synchronization/error-0x8004010f-when-sending-or-receiving-emails

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LucasLiu-MSFT avatar image
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LucasLiu-MSFT answered

Hi @BR0KK ,
Did you try to log in to the mailbox in OWA?
All clients have problems logging in? Or is it only the Outlook client on the PC has this problem?

1.What kind of license does the user use? Each license has different restrictions. Such as, if you using the Office for home, you could install Office on all your devices and sign in to Office on five devices at the same time. If you using the office for business, you could install and sign in to Office on 5 PCs or Macs, 5 tablets, and 5 phones.

2.According to research on the error message, this error is more like Outlook client related. Please try to create a new Outlook profile.You could following the steps in the article provided by AlexC-8264.

3.Please make sure that outlook client upgrade to the lastest version.

In addtion, currently in Microsoft Q&A we only support English. So in order to better solve this issue, please provide English version for the error information provided later. Thanks for your understanding.



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BR0KK avatar image
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BR0KK answered LucasLiu-MSFT commented

Hi thx for the answers i'll speak to the customer and get more details.

Its not the software aka. outlook that can't be opened its a mailbox within outlook that can not be accessed.
Outlook runs just fine with only one mailbox installed but if i add the other two it behaves strangely

Outlook is also licensed correctly

Those are full exchange mailboxes and he added them in the accounts tabs. Login is fine even owa works fine too
He added all three mailboxes on every device he owns so it's maybe 9 or 10 devices that are accessing all of these mailboxes simultaneously.

I read that exchange online has a hardcoded connection limit of arround 27-30? and each device needs at least 2 connections per mailbox. In this case he would have 19-20 connections open simultaneusly

thx


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Hi @BR0KK ,

What is the situation of users mailbox now? Does user follow the above method?

Does the Outlook client in the mobile phone or IPAD also have this issue?

I think this issue is not caused by "hardcoded connection limit". Due to equipment limitations, I can not to reproduce your customer's configuration, but I added enough user mailboxes in an Outlook client. After adding, all mailboxes can send and receive mail normally. In addition, user mailboxes can also work normally in OWA according to your description. It shows that there is no issue with the normal connection of the user's mailbox.



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Talked to a support rep from microsoft and he said that they have a limit in place that can not be changed, even by them.

They told me the right way to do this is by sharing the mailboxes instead of opening them 1x1

On my on Prem Exchanges i could alter the limit because one of my clients uses the Public Folder to an excess. I had to manually upgrade the limit over 100 connections.

I'm going to talk to the customer today i think. He's supposed to call me.

But then again its a crossover day between a hooliday so it might not happen today :)

THX again for the help

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Hi @BR0KK ,
Yes, most of the restrictions in Exchange online cannot be changed by us.

The solution proposed by Microsoft is also feasible, we could create a shared mailbox and assign the "full access" and "Send As" permission of shared mailbox to primary user mailbox. Then the user mailbox could add the shared mailbox and send mail through shared mailbox address. Another advantage of this method is that the shared mailbox does not need to be assigned a license.
97367-image.png

Please refer to: Mailbox storage limits



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