New Exchange 2019 Server. Outlook 2019 clients cannot connect. OWA clients can

Danny Slye 0

The connection to Microsoft Exchange is unavailable

SokiGuo-MSFT 28,631 Reputation points Microsoft Vendor

2024-05-20T07:43:32.6233333+00:00

Hi @Danny Slye

Welcome to our forum!

For better research, please provide more details about this case:

Are you unable to open the Outlook desktop client?

Did you do anything before this issue occurred?

Are there any error codes or prompts? If there are screenshots, please be careful to hide your private information.
Danny Slye 0 Reputation points

2024-05-20T15:06:46.0966667+00:00

This is a new simple on-premise Exchange 2019 Server deployment with Outlook 2019 clients. OWA clients can connect and send/receive mail but Outlook clients can't. There is no Internet connectivity. I get the standard Outlook error, "Cannot start Microsoft Outlook. Unable to open the Outlook Window, The set of folders cannot be opened. You must connect to Microsoft Exchange with the current profiled before you can synchronize your folders with you Outlook data filed(.ost)". When you start Outlook. it populates the form with your account and the exchange server but it fails on the next step.

1 answer

SokiGuo-MSFT 28,631 Reputation points Microsoft Vendor

2024-05-23T07:55:18.1166667+00:00
Hi @Danny Slye

Thanks for your reply!

According to the error message, there are several troubleshooting steps you can try to resolve the issue:

Disabling cached mode fixed this for my client. Control Panel> Mail > Email Accounts > Change > More Settings > Advanced > uncheck the box to "Use Cached Exhange Mode".

Disconnect your work school account through settings and then reconnect it.

Refer to the settings of this document: https://www.repairwin.com/fix-outlook-error-you-must-connect-to-microsoft-exchange-at-least-once-before-you-can-use-your-outlook-data-file-ost-solved/.

(Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)

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SokiGuo-MSFT 28,631 Reputation points Microsoft Vendor

2024-05-28T06:25:40.8066667+00:00

Hi @Danny Slye

Just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back. If you think my reply is helpful to you, please remember to mark it as an answer. Warm thanks.

David Kennedy 0 Reputation points

2024-11-22T00:03:08.2933333+00:00

This article was not helpful for me. I'm not sure how to disconnect my account. I could not find anything about 'disconnecting the work/school account' in the link provided.
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New Exchange 2019 Server. Outlook 2019 clients cannot connect. OWA clients can

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