Cannot Start Microsoft Outlook Cannot Open The Outlook Window You Must Connect To Microsoft Exchange

[Vickiana Sconyers]

Cannotstart Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. You must connect to Microsoft Exchange with the current profile before you can synchronise your folders with your Outlook data file (.ost)

does anyone in Microsoft know what this means and how to correct it, this issue has been going on for nearly 12 months now. i am using a different version of outlook that is not connected with Microsoft 365 and will not synchronise with all the apps in the Suite plus i pay a premium to use this and not have it work

Hi. I recently had a power outage and when my computer came back on, it has not allowed to access outlook since. I have tried uninstalling and re-installing and continue to get the same error message. The message says exactly: Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The file C:\Users\Rhos\AppData\Local\Microsoft\Outlook\rho...@usmarketingsource.com.ost cannot be accessed. You must connect to the Microsoft Exchange at least once before you use your Outlook data file (.ost).

I have tried signing in to the microsoft exchange countless times and have signed in under both my shared account and the original account holders account information as well and every time I get the same message. Even after uninstalling and re-installing 5 times now.

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Hi @Ramanavenkat ,

Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.

The similar issue is explained here -to/how-to-resolve-unable-to-expand-the-folders-errors-could-have-been-detected-in-the-file-xxxx-ost-error-in-outlook/ . Take a look for the possible solutions. Hope this helps. Thanks!

There's another interesting issue regarding Microsoft Outlook (Office 365 / 2013), Exchange 2013 SP1 and Active Directory.On a freshly installed Windows 7 x64 Professional computer I installed Microsoft Office 365 and tried to connect to our local Exchange 2013 Server. Suddenly the following error appears:

Creating another datafile and trying to switch the file in the email account. The data file cannot be switched because the "Browse"-Button is grey. Even though the newly created datafile is set as default. When set as default Outlook starts, but does not get emails in the new datafile. Other mailboxes also cannot be added.

I'm not sure if the problem could have been solved in another way but I am going to present you what finally worked for me. It seemed that the user's mailbox was damaged somehow. I still don't know exactly what the problem was. So my solution finally was to re-create the users's mailbox.

It may happen that either the ExportRequest or the ImportRequest gets stuck in the status "Queued". In my case I had some other ExportRequests in my Get-MailboxExportRequest result. You may remove the completed requests using this command per example:

Once the export is completed we need to disable the user's mailbox first. Be aware that removing the mailbox before it was disabled would also remove the whole active directory user account. The disabling removes the connection between the user account and the mailbox.

In my case (Microsoft Exchange Server 2013 CU4 (SP1)) the disabled mailbox wasn't in the list so I listed all other mailboxes which in my case is still OK because I don't have that many. Other users may need to use a more specific filter in their command:

The user's mailbox is now deleted and we are ready to create a new one. I simply logged into "ECP" and created a new mailbox for the user. After the Mailbox got created we are ready to import the exported emails into the new mailbox using:

After the Import is finished I would recommend to delete the user's outlook profile and create a new one. In my case it was still buggy before I did this, and I also removed and re-assigned the permissions to other mailboxes for the user, just in case.

One last thing: After the whole procedure it happened that internal users who tried to send emails to the user's email account got an "email could not be delivered" error. I think this is because the MailboxGuid of course has changed and the server still tries to deliver the emails to the old mailbox. The users who are trying to send an email to the user's mailbox needed to get the latest changes in their offline address book done. It doesn't seem to affect all users but some, so I created a tutorial for the affected users and sent it to them if they reported the error.

You may have been able to solve this a lot easier. Close out of outlook on all other machines where that user may be logged in. Then open on the new computer. I have seen this issue about 4 times so far, always the user left outlook open on there old computer. Once outlook is launched on the new computer (initial setup) then you can go back to having outlook open in both places. I am trying to figure out why this behavior exists.

start - controlpanal - mail - email account - e mail - dubble click on mail address -now open change e mail account box - more setting -connection tab - tik connect to microsoft exchange using HTTP - click on exchange proxy setting - now open microsoft exchane proxy setting box - uncheck connect using ssl only - and put your exchange server ip address in box - ok

"Cannot start microsoft outlook. Cannot open the outlook window. The set of folders cannot be opened. The file c:\users\username\appdata\local\microsoft\outlook\user...@domain.name - profilename.ost is not an outlook data file (.ost).

I have a small, standalone network, windows 2012 domain controllers, exchange 2010 server with no mailboxes and exchange 2016 server with all the mailboxes. The production network works fine and outlook can connect.

The issue I cannot start Microsoft Outlook. I cannot open the Outlook window. The set of folders cannot be opened. The attempt to log on to Microsoft Exchange has failed. " directly related to corruption of either Outlook data file (OST and PST) or Outlook profile. I suggest you open Outlook in safe mode and check if it is still crashing. If the issue still persists, then check out this article for more troubleshooting, Steps to fix Outlook error "The attempt to log on to Microsoft Exchange has failed" - Troubleshooting guide .

When I open up outlook without cached mode enabled I get the following error: Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance.

When I open up outlook with cached mode enabled I get the following error: Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened.You must connect to Microsoft Exchange with the current profile before you can synchronize your folders with your Outlook data file (.ost).

Now I have tried to recreate my profile, I have tried it with Outlook 2010 and 2013, I have created new users I have reinstalled Outlook, I tried it on different computers. Nothing works. I am stumped on this I have no idea why my mail would work fine but not through the outlook client.

I should add (I forgot to mention it in the original post) that the autoconfigure does not work properly. It detects the server but it populates it as a very long name (not my exchange server name). I did what you said and I still get the same error message. Here is the code from the 2 commands you asked me to provide.

Run the above to set the internal hostname to the same as the external one, enable SSL Offloading, and setting the authentication methods for external to basic, and internal to basic, ntlm, and negotiate.

You must add an DNS Record for mail.pro-itsolutions.com to point to your internal IP (this is called split DNS, where internally it points to an internal IP, and externally it points to an external ip).

I also see on that you are using a self signed cert - this will cause errors, and you should buy a 5 domain SAN Certificate (Goddady is the cheapest I could find) with mail.pro-itsolutions.com, autoconfigure.pro-itsolutions.com, pro-itsolutions.com (Default name on certificate) and any other names you would like to have on it.

It looks like they are trying to make it very hard for people to actually make things work properly. Why would it be so complicated to make your Outlook client work with Exchange. In the past this was not even something that you tested because you knew it would work out of the box. Shame on you Microsoft.

Is that how people get their Outlook clients to open up with Exchange 2013? (I would have a very hard time believing that this would be the only solution to getting your Outlook client to open up properly in Exchange 2013?)

Two existing email accounts were supposidly transferred (or she attempted to transfer them, unsuccessfully) to the new Outlook 2019 email client. The two mail accounts are a simple personal email, xx...@hotmail.co.uk and a work email which I believe is an Exchange Server based corporate email account.

A problem has appeared, in that when an attempt is made to start up Outlook a series of strange messages in accompanied by a yellow triangles with a ! inside pop up and then Outlook promptly shuts down. Consequently the new Outlook 2019 has not successfully been used, as yet.

All other components of Office 2019 work fine e.g. Word, PowerPoint, Excel, etc.

Error messages > > >

1st message:

The name cannot be matched to a name in the address list

2nd message:

Cannot start Microsoft Outlook. Cannot open the Outlook Window. The set of folders cannot be opened

The file C:\users\administrator.lenovo-G550\appdata\local\microsoft\outlook\xx...@hotmail.co.uk.ost

You must connect to Microsoft Exchange at least once before you can use your Outlook data file (.ost)

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