Exchange mailbox issues

Earlier today my Exchange mailbox stopped working with the error message 'Cannot Get Mail. The connection to the server failed.'
Our IT department has confirmed that the Exchange server is working correctly, and I'm able to access my emails on my iMac and Macbook. I can also access them via the Exchange remote web link so it's definitely not the server.
I've since updated to iOS 6.1.3 which hasn't resolved the issue.
I've deleted the mailbox and added it again a dozen times. And I've switched the phone on and off about 10 times at various stages of the delete/add process.
Now, when I try to add it again, I get the error message 'Exchange Account. Unable to verify account information.'
Does anyone have any ideas?
Thanks

Are you trying to do this while on cellular data or wifi? If cellular, which carrier... I've read ppl have had problems with Verizon when trying to do this but it's intermittant.
If wifi, is it corporate or your home wifi? Some corporate wifi's block access to exchange mail (mine does) so we have to use corporate desktop email to log conversations.

Similar Messages

The Microsoft Exchange Mailbox Replication service was unable to process a request due to an unexpected error. Event 1121

Hello all,
We migrated our Exchange server from 2003 to 2010. After the mailbox move requests were finished we had one that was stuck. We basically skipped it as we had a lot of other things to finish over the weekend. Here we are a year later, the old exchange server
is gone and so is an old DC. I am receiving an error every four minutes in event viewer.
The Microsoft Exchange Mailbox Replication service was unable to process a request due to an unexpected error.
Request GUID: '3e46b7cb-2ac0-42c1-98e8-57517a19ee40'
Database GUID: '5c6c573b-4f45-4ce3-b296-11cf69c2e2b6'
Error: Unable to find 'OLD Domain Controller' computer information in domain controller 'OLD Domain Controller' to perform the suitability check. Verify the fully qualified domain name..
I have checked in EMC for move requests. None are listed. I have checked the DCs listed in EMC properties. Old DC is not listed.
I also ran these commands in shell to attempt to cancel the stuck request.
Get-MoveRequest -MoveStatus Completed;Pending;InProgress;Failed;CompletedWithWarning;Suspended;Queued;CompletionWithProgress : Remove-MoveRequest
NO changes. Still throwing error. Any suggestions? I also tried using the guid and shell to look at the move request. Systems replies no such request.

Hello,
Please try to restart iis services to check the result.
If the issue persists, I recommend you ping you DC server on your exchange server to check if your exchange server can communicate with your DC server.
If there are other DCs, please try to use set-adserversettings cmdlet to specify a DC for your exchange server.
Set-AdServerSettings
http://technet.microsoft.com/en-us/library/dd298063(v=exchg.150).aspx
Besides, please install the lasted rollup to check the result.
Cara Chen
TechNet Community Support

The Microsoft Exchange Mailbox Replication service was unable to process a request due to an unexpected error. : Error: An Active Directory Constraint Violation error occurred

Hello,
We have a multi domain parent child AD domain infrastructure and now we upgraded our exchange from Exchange 2007 to Exchange 2013. Since last few days, we see the below error on the mailbox server event viewer.
EVENT ID : 1121
The Microsoft Exchange Mailbox Replication service was unable to process a request due to an unexpected error.
Request GUID: '93a7d1ca-68a1-4cd9-9edb-a4ce2f7bb4cd'
Database GUID: '83d028ec-439d-4904-a0e4-1d3bc0f58809'
Error: An Active Directory Constraint Violation error occurred on <domain controller FQDN>. Additional information: The name reference is invalid.
This may be caused by replication latency between Active Directory domain controllers.
Active directory response: 000020B5: AtrErr: DSID-0315286E, #1:
Our Exchange setup is in parent domain, but we keep on getting this error for various domain controllers in each child domain in the same site. We then configured one of the parent domain domain controller on Exchange. Still we are getting this error for
the configured parent domain DC.
Verified the AD replication and there is no latency or pending stuffs.
Any support to resolve this issue will be highly appreciated. Thank you in advance.
Regards,
Jnana R Dash

Hi,
In addition to Ed's suggestion, I would like to clarify the following things for troubleshooting:
1. Please restart IIS at first.
2. If the issue persists, please ping your DC on your Exchange server to check if Exchange can communicate with DC.
Hope it helps.
Best regards,
Amy Wang
TechNet Community Support

The Microsoft Exchange Mailbox Replication service was unable to process a request due to an unexpected error

Since demoting a child domain a few days ago, Exchange 2013 is still trying to contact it and as a result generating errors in the application event logs. I had a similar problem which I solved by removing some old migration batches, now I have a problem
with the Microsoft Exchange Mailbox Replication service.
The event logged is:
The Microsoft Exchange Mailbox Replication service was unable to process a request due to an unexpected error.
Request GUID: '0b6c0f5a-0563-48e2-8b97-e0781c6cc69a'
Database GUID: '23258311-ad29-41c2-a842-522f48baa267'
Error: Unable to read from Active Directory. --> The call to Microsoft Exchange Active Directory Topology service on server 'TopologyClientTcpEndpoint (localhost)' returned an error. Error details Unable to find a suitable directory server for
domain 'admin.riddlesdown.local'.. --> Unable to find a suitable directory server for domain 'admin.riddlesdown.local'..
Process Microsoft.Exchange.Directory.TopologyService.exe (PID=2280). Exchange Active Directory Provider could not find an available domain controller in domain admin.riddlesdown.local. This event may be caused by network connectivity issues or
configured incorrectly DNS server.
The domain doesn't exist in AD Sites and Services, I have removed all traces from DNS but this is still occurring. When I run Get-ADServerSettings | fl it reports no trace of the domain or a DC that was previously in it.
How can I stop these events occurring and is it likely to be causing something else not to work correctly.
We are running Exchange 2013 CU1

No, that didn't work. Here are more details:
Source: MSExchange ADAccess (EventID: 2130)
Process Microsoft.Exchange.Directory.TopologyService.exe (PID=2280). Exchange Active Directory Provider could not find an available domain controller in domain admin.riddlesdown.local. This event may be caused by network connectivity issues or configured
incorrectly DNS server.
Source: MSExchange ADAccess (EventID: 2119)
Process Microsoft.Exchange.Directory.TopologyService.exe (PID=2280). Error DNS_ERROR_RCODE_NAME_ERROR (0x8007232B) occurred when DNS was queried for the service location (SRV) resource record used to locate a domain controller for domain admin.riddlesdown.local
The query was for the SRV record for _ldap._tcp.dc._msdcs.admin.riddlesdown.local
Common causes of this error include the following:
- The DNS SRV records required to locate a domain controller for the domain are not registered in DNS. These records are registered with a DNS server automatically when a domain controller is added to a domain. They are updated by the domain controller
at set intervals. This computer is configured to use DNS servers with following IP addresses:
10.59.100.7
10.59.100.8
fec0:0:0:ffff::1Microsoft.Exchange.Directory.TopologyService.exe
fec0:0:0:ffff::2Microsoft.Exchange.Directory.TopologyService.exe
fec0:0:0:ffff::3Microsoft.Exchange.Directory.TopologyService.exe
- One or more of the following zones do not include delegation to its child zone:
admin.riddlesdown.local
riddlesdown.local
local
. (the root zone)
Source: MSExchange Mailbox Replication Service (EventID: 1121)
The Microsoft Exchange Mailbox Replication service was unable to process a request due to an unexpected error.
Request GUID: '87f4b926-0621-43d3-afeb-fe475ee6d850'
Database GUID: '23258311-ad29-41c2-a842-522f48baa267'
Error: Unable to read from Active Directory. --> The call to Microsoft Exchange Active Directory Topology service on server 'TopologyClientTcpEndpoint (localhost)' returned an error. Error details Unable to find a suitable directory server for domain 'admin.riddlesdown.local'..
--> Unable to find a suitable directory server for domain 'admin.riddlesdown.local'..
Something is cause the Exchange server to go looking for our old domain, but what and why?

Outlook with Exchange connection issues

I am implementing a security policy which includes blocking all outbound traffic on the firewall of our network (Except normal 80, 443 etc). It seems
that if I apply this, some users aren't able to connect to exchange. This appears to be related to Outlook Anywhere. What ports would I need to allow to prevent this connection issue?

Hi
As per the information and details provided by you, to solve the Outlook with Exchange connection issues, Please follow these steps: -
Microsoft introduced
RPC over HHTP as a better way for Outlook client to connect to Exchange. The MAPI connections still use RPCs, but they encapsulate those with an HTTP connection. Since that HTTP connection is secured using SSL, it is may be
more accurate to call it RPC over HTTPS. These connections only require connectivity
over TCP port 443, which as you know is assigned to HTTPS and is normally open by
firewall admin for web servers.
Outlook Anywhere wraps
Remote Procedure Calls inside an HTTP layer to allow connectivity with the Exchange server. This simplifies the firewall administration process requiring only
the SSL port 443 to be opened to the CAS (Client Access Server) instead of several ports to the actual Mailbox Server (MBX).
I hope this information will be helpful for you.
Thanks and regards
Shweta@G

CFLDAP Create User with Exchange Mailbox

I'm trying to create Active Directory users via the cfldap
command, and that part seems to work ok. I'm having 2 problems with
my script though. First, here is my code snippet for the cfldap add
query:
<cfldap action="add"
dn="CN=#myCN#,OU=StudentPopulation,OU=People,DC=server,DC=com"
attributes="objectClass=top,person,organizationalPerson,user,inetOrgPerson;cn=#myCN#;
sn=#query.LAST_NAME#;givenName=#query.FIRST_NAME#;sAMAccountName=#myAN#;mail=#myAN#@server .com;displayName=#myCN#;description=#query.ID_NUMBER#;wWWHomePage=http://server.com/#myAN# ;initials=#query.MIDDLE_INITIAL#;userPrincipalName=[email protected];mailNickname=#myAN#;n ame=#myCN#"
delimiter=";"
separator=","
server="some.server.com"
port="389"
username="adminUser"
password="adminPass">
My first issue is that i have to also generate a dsmod
command that i put into a batch file and execute on the server. It
looks like:
dsmod user
"CN=#myCN#,OU=StudentPopulation,OU=People,DC=server,DC=com" -pwd
SOME@#myUID# -mustchpwd yes -disabled no
So is there anyway i can encorperate that dsmod into my
origional query?
Secondly, I want to create an exchange mailbox with my AD
account. Using an LDIF statement would require a line like:
homeMDB:
CN=SERVER-Employees,CN=SERVER,CN=InformationStore,CN=XMAIL,CN=Servers,CN=First
Administrative Group,CN=Administrative Groups,CN=Our Company
Name,CN=Microsoft
Exchange,CN=Services,CN=Configuration,DC=server,DC=com
I tried changing homeMDB variable to an attribute for my
cfldap statement, but it threw a "you can't do this" error.
Anyone have any ideas on how i can get this to work?

I don't know if you can or not, but you can write it out to a
text file and then use cfexecute to run the text file (.bat). I
hope that this helps. Thanks.
Chris

Second Exchange Mailbox Random Disconnects In Outlook 2010

We have our users temporarily using two exchange mailboxes in Outlook 2010. The primary account is fine (exchange is local) but the second account we recently adds seems to randomly disconnect and not automatically reconnect. The fix at the moment
is to reboot the computer and everything works fine but this is obviously annoying to the users.
Anyone else run into this issue or have a suggestion?
Thanks in advance.

Hi,
I recommend using separate profiles for each account if they are using a same one.
When the second mailbox cannot connect to Exchange server, it will leave some information/warning/error in the App log. Please post the details if there is any related content.
Thanks
Mavis
Mavis Huang
TechNet Community Support

Exchange 2013 issues - (new send email Stuck in Drafts not send)

Exchange 2013 issues - (new send email Stuck in Drafts folder not send)

I am also having this issue.
server 2012 VM with exchange 2013. plenty of resources, more than recommended so cannot be a BAck Pressure issue especially as no clients are connected yet.
In the early stages of setup and testing, mail sent to other mailboxes worked fine in outlook 2007 and OWA but after a few issue that developed and are now resolved, any e-mail send within outlook or OWA just goes straight into the drafts folder.
I tried, DNS setting changes under roles, on the server, on DNS server, MX DNS records, increased resources, looked at received connectors, changed and even deleted send connectors as this is not required for internal mail. Tried changing authentication
types but then outlook won't connect to, staying with Basic Auth.
Have not been able to test inbound e-mail as this is going to replace a production server and is not ready, although I could probably simulate a route from another server and push e-mail to it. Will try tomorrow.
I have spent about 20 hours trying to figure this out and made probably 40 changes. Change, test, rollback etc. Been searching through loads of forums and technet sites all with no help.
All services are started, server has been rebooted several times.
It is also an AD server and has both Exchange roles installed. There is no reason why it should not work. This is so frustrating, we don't have these issues with the now end of life Scalix, or MDaemon or Zimbra. Pity the client wanted a Microsoft solution.
To be honest there are not a lot of things that cannot be changed in ECP although there is more under exchange powershell however I am not familiar with all the commands yet. I have resorted to watching training videos even though I am a seasoned IT Pro, although
not so much with exchange it seems.
I have seen many people have this issue on Exchange 2007, 2010 and 2013. Someone must know how to resolve this or find a work around?
So far I have an expensive solution the client has purchased that I cannot get running properly.
Aside from this issue, I really like the new Server 2012 and new Hyper-V.
I was about to install Exchange Server 2013 on a physical machine due to this f#ckin' issue. But a post for the DNS change has saved my life:
http://social.technet.microsoft.com/Forums/en-US/exchangeserverpreview/thread/04c0147b-f4e3-4041-a566-310854e71068/ (rafael9908's answer)
And thanks Jesper Bernle for excellent info provided by your link.

Sent emails, from replies, to email in Shared Exchange mailbox folders - Outlook 2013 - Office 365 Midsize Business

1. Outlook 2013 lets replies to emails from another folder than inbox wind up in that same folder.
Options - email - save - a checkbox
2. A registry setting lets email sent from shared exchange mailboxes wind up in the "sent objects" folder of that mailbox.
http://social.technet.microsoft.com/Forums/en-US/57f9f9dc-cc00-4910-a09e-1ea201dbf05c/action?threadDisplayName=office-365-outlook-2010-quotdefault-email-reply-or-fromquot-address
I need feature 1. to show up in the shared mailbox as well as the default mailbox. All my problems would be solved if I could have this behaviour in the inbox folder of the shared mailbox as well.
UniSent helped us with this on SBS2003 and Outlook 2003- 2007 but does the same trick as the registry setting in Office 2013.
cheers

Hi,
There is no build-in setting in Outlook to achieve this, you may try a code solution here:
http://social.technet.microsoft.com/Forums/en-US/ad92302a-7e60-4114-a79a-b9759a7368c1/move-sent-mails-to-other-mailbox?forum=officeitproprevious
Since we are not the best source for coding, if you need any assistance on the code sample, you can post a question in Outlook for Developers forum:
http://social.msdn.microsoft.com/Forums/office/en-US/home?forum=outlookdev
Thank you for the understanding.
Regards,
Steve Fan
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

How to remove on-premise Exchange mailbox from forwaring to hosted mailbox

We moved an on-premise Exchange 2007 mailbox to Microsoft Office 365 hosted Exchange. We have since removed the mailbox from the hosted Exchange but when we send emails to the address now, they get sent to the hosted Exchange mailbox.

Hi,
Since the issue is related to Office 365 hosted Exchange instead of the Office 365 ProPlus which is the version of Office that comes with many Office 365 plans. I recommend we can ask a question in Microsoft Exchange Online forum for more professional
suggestion:
http://social.technet.microsoft.com/Forums/en-US/home?forum=onlineservicesexchange
Thanks,
Winnie Liang
TechNet Community Support

False Signature is chosen, when i use multiple exchange mailboxes in Outlook 2010

Hi,
My Problem:
A user has his own Exchange mailbox and an additional exchange mailbox with full access permissions connected in Outlook 2010. I have made different signatures for every Mailbox.
Mailbox A is working properly. Sending and answering / forwarding works correctly with signature A.
When i send a mail with mailbox B, outlook uses signature B.
When i ANSWER a mail with mailbox B, outlook uses signature A.
The "from" button is highlighted on mailbox B. When i choose mailbox B in the from button manually, it works .....
Any idea?
Regards,
Dave

Hi,
I need to confirm one thing first, did you add Mailbox B as an additional Mailbox, or a second Account in E-mail list?
Regards,
Melon Chen
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

PST Import to archive mailbox - Stays in queue until i restart the microsoft exchange mailbox replication service

Good Day all,
Stretched dag between site a and site b. Cas array at each site. Mailboxes primarily are located in site a unless there is a major outage then the dag flips to site b. setup two archive databases, one in site A on a non replicated partition
of the dag server and one in site B on a separate mailbox only server.
All exchange servers are patched to the latest sp and rollup.
site a has no issues at all, everything i import queues up and processes with no problems
at site b two imports will process and then stop until i restart the microsoft exchange mailbox replication service on the cas server. No errors no nothing just lots of move request sitting in the queue.
considering i have an insane amount of psts to import there does anyone have any suggestions besides setting up a task to restart the imicrosoft exchange mailbox replication service every 15 minutes?
thanks for your help in advance

Yeah I know from my research when I was setting up the dag you were not a fan of the stretched DAG but it works for us really well and passed all fail over tests that we ran on it <knocking on wood>.
Yes its running but it stops working after one session. I have had success in raising the transfer count from 2 to 5 but I can't really go much higher without taking down the server. the problem is when I am transferring someone with hundreds
of PSTs I have to babysit it...which sucks..
anyway, thanks for your help and have a great day :)

How can I block all other mail account just to only use the exchange mailbox of our company? This is to prevent the user to setup his on company iPhone.

How can I block all other mail account just to only use the exchange mailbox of our company? This is to prevent the user to setup his on company iPhone.

I don't know if I'm asking this all in a way that can be understood? Thanks ED3K, however that part I do understand (in the link you provided!)
What I need to know is "how" I can separate or rather create another Apple ID for my son-who is currently using "my Apple ID?" If there is a way to let him keep "all" his info on his phone (eg-contacts, music, app's, etc.) without doing a "reset?') Somehow I need to go into his phone's setting-create a new Apple ID and possibly a new password so he can still use our combined iCloud & Itunes account?
Also then letting me take back my Apple ID & password, but again allowing us (my son and I) to use the same iCloud & Itunes account? Does that make more sense??? I'm sincerely trying to get this cleared up once and for all----just need guidance from someone who has a true understanding of the whole Apple iCloud/Itunes system!
Thanks again for "anyone" that can help me!!!

How do I setup shared Exchange mailbox with Mail (Yosemite)?

Hello,
we use Office 365 hosting for our mails. Setting up my default Exchange account is no problem at all, just provide e-Mail address, password and let auto discover finish the rest through System Preferences -> Internet accounts.
But I also need to setup two shared Exchange mailboxes. If I setup the e-mail address of the shared mailbox. I tried to set it up as follows:
System Preferences -> Internet Accounts -> Add Exchange Account
Name: Shared Mailbox
Email Address: [email protected]
Password <own AD password>
As expected: Internet Accounts couldn't log in to the Exchange server "autodiscover-s.outlook.com". Make sure the email address and password you entered are correct. Then, enter your user name and click Continue.
<Continue>
Account Settings
Account Type: Exchange
Description: Shared Mailbox
User Name: <own smtp mail address>
Password: <own AD password>
Server Address: outlook.office365.com
<Continue>
Account Summary
Account type: Exchange
Full name: Shared Mailbox
Email address: [email protected]
Server address: outlook.office365.com
<Continue>
Select the apps to use with "[email protected]": Mail
=> There was a problem setting up the Mail account: an unknown error occurred.
05/01/15 13:02:10,706 com.apple.internetaccounts[313]: Already have account E2E3FF00-2B0E-4F75-ADD9-FB********** configured for user: <[email protected]> host: outlook.office365.com
So to add an additional account to access a different mailbox on the Exchange sever with the same credentials as the personal mailbox is apparently no option any more. On the other hand I haven't found any option to add according folders from other mail address inboxes to my personal account in any of the Preferences from Mail (Yosemite, 8.1) or any menu item, that would allow me to add the inboxes of other shared Exchange server mail boxes I have access to.
The same is true for Mail (iOS 8.1.2), thus I have not found a solution to configure the shared mailboxes on my iOS devices either.
Trying to setup an "Add Other Account" using IMAP did not succeed either. It always uses my personal mailbox, because I only have my personal user to access the shared mailbox and downloads my personal inbox instead of the one of the shared mailbox.
Do I really have to fall back to Outlook 2011 Mac to be able to use this feature and miss out on all the hands off features from Yosemite?

i too use office 365 shared mailboxes and it took me a long time to work out to add them to my ios mail app , this worked for me :
start setting up a normal exchange account , put your shared email address in the username and you main email account password.
it will fail to do the auto-discover thing , but when you click on continue it eil allow you to manually enter the details :
Name : < whatever>
email : <your shared email a/c address i.e [email protected] >
description : <whatever>
incoming mail
Host name : outlook.office365.com
username : <your main email address / shared i.e [email protected]/myshared >
password : < your main account password >
outgoing mail server:
SMTP : smtp.office365.com
username : <your mail email i.e. [email protected] >
password < your main account password >
use ssl <YES>
authentication : Password
server port 587
this worked fine on every IOS device i own, but somehow it doesn't work with my Yosemite mail , so if anybody can help with Yosemite mail it would be much appreciated.
Cheers;
RP

Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database 1006.

HI all,
I ran into a problem with one of the servers in my DAG. Due to a backup failure, the log partition filled up and the Exchange database went offline on this particular server. The DAG continued to function on the other server. So this particular
DB01 had only some test accounts in it so I removed the database copy. Unfortunately the removal must not have completed correctly.
After recovering the needed space in the partition, I tried to recopy the database and it failed. So I deleted the entire database from the active server and it successfully removed it from the active server. Now on both the servers the database
is not showing, however I'm receiving the error below which indicates to me that the service still thinks the database exists. I am also getting event 4113 Database redundancy health check failed for the database copy as it shows there is only one copy
of the database (failed redundancy) but there should be zero copies.
This database no longer exists in AD as I have verified this with ADSI so it must have something on the exchange server that is still telling the service the database exists.
Can you point me to the location to clean this up?
Log Name:      Application
Source:        MSExchange Mailbox Replication
Date:          02/25/2011 2:00:07 PM
Event ID:      1006
Task Category: Service
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      email1.domain.com
Description:
The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database.
Database: DB01
Error: MapiExceptionUnknownUser: Unable to open message store. (hr=0x80004005, ec=1003)
Diagnostic context:
    Lid: 55847   EMSMDBPOOL.EcPoolSessionDoRpc called [length=243]
    Lid: 43559   EMSMDBPOOL.EcPoolSessionDoRpc returned [ec=0x0][length=200][latency=0]
    Lid: 23226   --- ROP Parse Start ---
    Lid: 27962   ROP: ropLogon [254]
    Lid: 17082   ROP Error: 0x3EB
    Lid: 26937
    Lid: 21921   StoreEc: 0x3EB
    Lid: 27962   ROP: ropExtendedError [250]
    Lid: 1494    ---- Remote Context Beg ----
    Lid: 26426   ROP: ropLogon [254]
    Lid: 22086
    Lid: 27206
    Lid: 17990
    Lid: 16966   StoreEc: 0x8004010F
    Lid: 31433   StoreEc: 0x8004010F
    Lid: 8620    StoreEc: 0x3EB
    Lid: 1750    ---- Remote Context End ----
    Lid: 26849
    Lid: 21817   ROP Failure: 0x3EB
    Lid: 26297
    Lid: 16585   StoreEc: 0x3EB
    Lid: 32441
    Lid: 1706    StoreEc: 0x3EB
    Lid: 24761
    Lid: 20665   StoreEc: 0x3EB
    Lid: 25785
    Lid: 29881   StoreEc: 0x3EB
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
    <Provider Name="MSExchange Mailbox Replication" />
    <EventID Qualifiers="32772">1006</EventID>
    <Level>3</Level>
    <Task>1</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2011-02-25T22:00:07.000000000Z" />
    <EventRecordID>181576</EventRecordID>
    <Channel>Application</Channel>
    <Computer>email1.domain.com</Computer>
    <Security />
</System>
<EventData>
    <Data>DB01</Data>
    <Data>MapiExceptionUnknownUser: Unable to open message store. (hr=0x80004005, ec=1003)
Diagnostic context:
    Lid: 55847   EMSMDBPOOL.EcPoolSessionDoRpc called [length=243]
    Lid: 43559   EMSMDBPOOL.EcPoolSessionDoRpc returned [ec=0x0][length=200][latency=0]
    Lid: 23226   --- ROP Parse Start ---
    Lid: 27962   ROP: ropLogon [254]
    Lid: 17082   ROP Error: 0x3EB
    Lid: 26937
    Lid: 21921   StoreEc: 0x3EB
    Lid: 27962   ROP: ropExtendedError [250]
    Lid: 1494    ---- Remote Context Beg ----
    Lid: 26426   ROP: ropLogon [254]
    Lid: 22086
    Lid: 27206
    Lid: 17990
    Lid: 16966   StoreEc: 0x8004010F
    Lid: 31433   StoreEc: 0x8004010F
    Lid: 8620    StoreEc: 0x3EB
    Lid: 1750    ---- Remote Context End ----
    Lid: 26849
    Lid: 21817   ROP Failure: 0x3EB
    Lid: 26297
    Lid: 16585   StoreEc: 0x3EB
    Lid: 32441
    Lid: 1706    StoreEc: 0x3EB
    Lid: 24761
    Lid: 20665   StoreEc: 0x3EB
    Lid: 25785
    Lid: 29881   StoreEc: 0x3EB     </Data>
</EventData>
</Event>

Hi
This error occurs because the MailboxReplicationService (MRS) currently caches Mailbox Database information past the lifetime of some databases.
Restarting the service will clear the cache.
Maybe it is the simplest way to solve it.
If it doesn’t work, you can try cmd to check it.
Get-MailboxDatabase : Can you find the database which you delete?
Remove-MailboxDatabase -Identity "MyDatabase": You can try to delete database if you can see the database.

Exchange mailbox issues

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