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Disconnect all PST files. Will it happen again? It yes, recreate the Outlook profile. If you won't see any progress, run Online Repair. The last step would be reinstalling MS Office.<br>(I assume you have enough RAM and CPU usage is low.) <br><br>
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Disconnect all PST files. Will it happen again? It yes, recreate the Outlook profile. If you won't see any progress, run Online Repair. The last step would be reinstalling MS Office.
(I assume you have enough RAM and CPU usage is low.)



Systems Administrator 

J.R. Sitman

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I exported a PST last week.&nbsp; How do I disconnect it?
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I exported a PST last week.  How do I disconnect it?

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Open Outlook -&gt; File -&gt; Info -&gt; Account Settings -&gt; Account Settings -&gt; Data Files tab -&gt; select the PST file you want to remove and click Remove.
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Open Outlook -> File -> Info -> Account Settings -> Account Settings -> Data Files tab -> select the PST file you want to remove and click Remove.

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Thanks.&nbsp; &nbsp;I am not at the location so I will update this tomorrow.
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Thanks.   I am not at the location so I will update this tomorrow.

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<h2>Does it happen when you click on the specific email or folder?</h2><br><h2><em>Outlook hangs when clicking in Conversation History folder or when clicking an email with a custom message class, such as a voice mail email</em></h2><a href="https://support.microsoft.com/en-us/office/outlook-hangs-when-clicking-in-conversation-history-folder-or-when-clicking-an-email-with-a-custom-message-class-such-as-a-voice-mail-email-0632c6fe-29b0-4da4-8443-bcf19fc6179c" rel="ugc">https://support.microsoft.com/en-us/office/outlook-hangs-when-clicking-in-conversation-history-folder-or-when-clicking-an-email-with-a-custom-message-class-such-as-a-voice-mail-email-0632c6fe-29b0-4da4-8443-bcf19fc6179c</a>
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DOES IT HAPPEN WHEN YOU CLICK ON THE SPECIFIC EMAIL OR FOLDER?



OUTLOOK HANGS WHEN CLICKING IN CONVERSATION HISTORY FOLDER OR WHEN CLICKING AN EMAIL WITH A CUSTOM MESSAGE CLASS, SUCH AS A VOICE MAIL EMAIL

https://support.microsoft.com/en-us/office/outlook-hangs-when-clicking-in-conversation-history-folder-or-when-clicking-an-email-with-a-custom-message-class-such-as-a-voice-mail-email-0632c6fe-29b0-4da4-8443-bcf19fc6179c [https://support.microsoft.com/en-us/office/outlook-hangs-when-clicking-in-conversation-history-folder-or-when-clicking-an-email-with-a-custom-message-class-such-as-a-voice-mail-email-0632c6fe-29b0-4da4-8443-bcf19fc6179c]

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not sure.&nbsp; It is not my Outlook.&nbsp; &nbsp;I can ask.
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not sure.  It is not my Outlook.   I can ask.

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I did both your suggestions. &nbsp; It is better now.&nbsp; FYI they did not know if it happened on a specific email<br><br>Thanks
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I did both your suggestions.   It is better now.  FYI they did not know if it happened on a specific email

Thanks

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What was the solution? Thank you.
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I marked FOX's answer as my solution?
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I understand I am just wondering which of his suggestions was the solution?
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I understand I am just wondering which of his suggestions was the solution?

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As far as I can tell the Repair was.
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Therefore, you should mark all posts suggesting Online Repair. Thank you.
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Therefore, you should mark all posts suggesting Online Repair. Thank you.

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your post and Fox's are both already marked as helpful or as the solution
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your post and Fox's are both already marked as helpful or as the solution

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<div class="content wysiwyg-content">
We use Office 365 but have Outlook 2016 connected to it. &nbsp;We just started using it and 3 times today Outlook said is was unresponsive. &nbsp; &nbsp;What can cause this? &nbsp;e.g. where should I start looking?<br />
<br />
Our upload is 30 mpbs and download is 3.5
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We use Office 365 but have Outlook 2016 connected to it.  We just started using it and 3 times today Outlook said is was unresponsive.    What can cause this?  e.g. where should I start looking?

Our upload is 30 mpbs and download is 3.5

How to trouble shoot Outlook Unresponsive problems

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.