Unable to open Outlook

Running outlook on Office 365 Home Premium.
Have 3 email accoints.
1 set up on the microsoft server & 2 set up as POP emails.
When opening outlook, message as follows appear - [email protected] cannot be opened.
Need help

Sounds like a corrupt OST file. Delete your OST file and outlook will re-create it when you open it again. This downloads the copy of your mailbox again so if you have a large mailbox it may take some time.
https://support.office.com/en-ie/article/Repair-Outlook-Data-Files-pst-and-ost-64842a0a-658a-4324-acc6-ef0a6e3567cd
DJ Grijalva | MCITP: EMA 2007/2010 SPA 2010 | www.persistentcerebro.com

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Greetings everyone!
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There are a few users that experience this, but maybe 1% of the environment. No other users can duplicate the issue.
We have tried clearing the cache.
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Any thoughts? Any help is greatly appreciated!
Thanks in advance!
NewGenPack

You have a PDF file that has been associated with a virtual Adobe Reader. Is Outlook virtualized? If so, which version? You have three applications at play here. We need more information.
Steve Thomas, Senior Consultant, Microsoft
App-V/MED-V/SCVMM/Server App-V/MDOP/AppCompat
http://blogs.technet.com/gladiatormsft/
The App-V Team blog: http://blogs.technet.com/appv/
The MED-V Team Blog: http://blogs.technet.com/medv
The SCVMM Team blog: http://blogs.technet.com/scvmm/
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ivone dos santos,
Do you see a message like this when you open one of your PDF documents?
Your PDF document is a special type of form called a "dynamic XFA form". The message is displayed when a dynamic content is not supported by a PDF viewer.
As far as I know, no PDF viewers for iOS and Android mobile devices support dynamic XFA forms. Here are the examples of the iOS apps that do not support dynamic XFA forms.
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The PDF preview feature in Dropbox and other apps
The message is trying to tell you to use the latest desktop version of Adobe Reader, not the mobile version of Adobe Reader. I agree that the sentence, "You can upgrade to the latest version of Adobe Reader...", is somewhat misleading. The message is baked into the dynamic XFA form that was authored by Adobe LiveCycle (desktop app) without regard for non-desktop apps (i.e. mobile apps). Upgrading to the latest version of Adobe Reader for iOS would not help in this case.
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Hi All
Exchange Server - 2013 CU2 (Windows 2012 Standard)
AD Server - 2003 R2 SP2
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mail.company.net - external name
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The certificate common name company.net doesn't match the mutual authentication string provided mail.company.net; however, a match was found in the subject alternative name extension.
please help.

Hi PS CL
[PS] C:\Windows\system32>Get-OutlookAnywhere
RunspaceId                         : c457e8aa-a0f3-4a0f-aa02-9eff24d02821
ServerName                         : exchange-svr01
SSLOffloading                      : True
ExternalHostname                   : mail.company.net
InternalHostname                   : exchange-svr01.domain.com
ExternalClientAuthenticationMethod : Negotiate
InternalClientAuthenticationMethod : Ntlm
IISAuthenticationMethods           : {Basic, Ntlm, Negotiate}
XropUrl                            :
ExternalClientsRequireSsl          : True
InternalClientsRequireSsl          : True
MetabasePath                       : IIS://exchange-svr01.domain.COM/W3SVC/1/ROOT/Rpc
Path                               : C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\rpc
ExtendedProtectionTokenChecking    : None
ExtendedProtectionFlags            : {}
ExtendedProtectionSPNList          : {}
AdminDisplayVersion                : Version 15.0 (Build 712.22)
Server                             : exchange-svr01
AdminDisplayName                   :
ExchangeVersion                    : 0.20 (15.0.0.0)
Name                               : Rpc (Default Web Site)
DistinguishedName                  : CN=Rpc (Default Web
                                     Site),CN=HTTP,CN=Protocols,CN=exchange-svr01,CN=Servers,CN=Exchange
Administrative
                                     Group (FYDIBOHF23SPDLT),CN=Administrative
Groups,CN=domain,CN=Microsoft
                                     Exchange,CN=Services,CN=Configuration,DC=domain,DC=COM
Identity                           : exchange-svr01\Rpc (Default Web Site)
Guid                               : 33c3cb74-e490-487d-844c-4072334089a1
ObjectCategory                     : domain.COM/Configuration/Schema/ms-Exch-Rpc-Http-Virtual-Directory
ObjectClass                        : {top, msExchVirtualDirectory, msExchRpcHttpVirtualDirectory}
WhenChanged                        : 8/17/2013 10:14:55 AM
WhenCreated                        : 6/25/2013 1:47:50 PM
WhenChangedUTC                     : 8/17/2013 2:14:55 AM
WhenCreatedUTC                     : 6/25/2013 5:47:50 AM
OrganizationId                     :
OriginatingServer                  : ADserver.domain.COM
IsValid                            : True
ObjectState                        : Changed

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I just downloaded Safari - when I click on a link in Outlook, I am unable to open it without cutting and pasting it in the browser. Please let me know which setting I need to change in Outlook and/or Safari to fix this problem. Thank you!

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I'm unable to open vCard exported from MS Outlook for Mac (2011) which adheres all requirements.

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This post is being transfered from the office 365 team because they created a brand new profile and i still get the same problem when connecting to their newly created one.
Any help you can provide would be much appreciated.
I really would like email running. Thanks very much !!!
Hi Everyone I have seen some threads on this topic and i have tried to follow all of their instructions and it hasn't solved my problem.
So this problem started happening 2 days ago.
Each time i open outlook I get prompted for Login Credentials. It has never happened before
I have tested it using this tool https://testconnectivity.microsoft.com and it works fine
I have removed my security credentials on the PC it hasn't solved it
I have a number of tablets and they are working fine
I have built new Outlook profiles
I have tried it in safe mode
In the Security settings for the Outlook Mail profile is set to Not Prompt for Security Credentials
The Login Security Mode is set to "Negotiate Authentication"
I have tried it with both Encryption and without
I'm able to login to Email online and send and recieve emails that way.
I have another user on Windows 8.1 and the problem started happening at the same time as me. I'm on Windows 7 Office 2010 Plus Proffessiona
I believe the other user is on a newer version of outlook than me.
I have spent all night trying different things and nothing has worked
I could really use your help.
Any help would be much appreciated i'm quite frusted not being able to send mail from outlook
Hi Alan,
I am sorry for the issue you are experiencing right now.
On Tuesday, August 5, 2013 at approximately 12:45 PM UTC, we receive a report that some of the users were unable to authenticate to the Exchange Online service when using the Outlook client. However, the issue has been restored.
Since you are still having the issue, please follow the steps below to do the confirmation.
1. Please make sure that all Outlook security patches and updates are installed on the affected computer. To check for the latest Outlook updates, please click on the link below.
2. To make sure whether the issue is related to the Outlook client or the service, please try configuring the test account I send you through private message on the affected computer to check whether the issue exists. To check the private message, please follow
the steps.
a. Please go to Your details section on the right side of the community site.
b. Click Private messages.
c. Click the subject title of the responses to read the message.
Please provide feedback, then we can move forward to check where exactly to look into the issue.
At last, I would like to confirm whether your organization only have Exchange Online or have hybrid environment.
Thanks,
Yang Yu
I noticed something a bit strange that SMTP is automatically put in front of the mailbox name.. i haven't seen that before
Went to windows update and there is nothing to install
it's interesting you say the 5th because that is exactly the last day that outlook successfully synced.. it hasn't worked since.. This is happening on 2 seperate computers and stopped working at the exact same time.
Hi Alan,
Thanks for the update.
Based on the currently situation, I understand when configuring the test account provided by Yang Yu the issue persists. And you have a number of tablets and they are working fine. Thus the issue could be related to the certain Outlook client on this certain
computer.
Since we focus on Office 365 issues in this forum, I'm so sorry that I’m not able to provide the detailed instructions.
To provide you with a better service, and sort out this issue more effectively, I suggest you post this issue in the following Outlook forum. The engineers there will help you get the issue fixed in a timelier manner.
Outlook forum:
At the same time, I will also continue doing some further tests and research. Thanks for your understanding and great efforts.
Any community members with related experience on this issue who could share it here are also appreciated.
Regards,
Xinyu

Hi Alan,
According to your description, the Outlook settings seems to be correct in your local machine. And some solutions have been tried to solve this issue:
Create a new Outlook profile, start Outlook in safe mode, clean credentials cache in computer ect.
But the issue persists. Please consider to configure your account on a computer which is working file with your colleague's Office 365 account to check whether the issue continues. If the issue only happens to your account, please access the mailbox in Webmail
and change the password to have a try.
Regards,
Winnie Liang
TechNet Community Support

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Hi Pat
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<Link Edited By Host>

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