This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
We have recently moved to exchange online and have also started to upgrade clients with o365/2019. Since moving to exchange online we are seeing a lot of freeing and being disconnected outlook and general slowness which results in either the user closing and re-opening outlook to fix. Most users are seeing the slowness From moving to O365 emails are now being stuck in the outbox which is a bit of a strange issue, this doesn't always happen but does to the odd user.
We do not have OST files, as the space is just not available. We are on non-prescient VDI's Windows 10, one image is office 2016 the other being o365/2019
We have tried the following:
New outlook profile
Safe mode
Deleted %appdata%
Started new profile on windows 10
Outlook on the web**
**Outlook on the web works well, we do not see any issues however we cannot give out outlook on the web to our users.
Any help would be much appreciated
Using Classic Outlook on Windows for personal email, calendar, and contact management
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
We are currently awaiting a reply from the support team. I am putting it on here for additional ideas as we are at a dead end...
Dear Jack234532,
Good day! Thank you for posting to Microsoft Community.
We apologize for the inconvenience it caused to you and totally understand you’ve tried many methods. Given your situation and specific environment, for we lack tools for further analyzing, I recommend you contact global admin, let admin reach our online support to further check current client issues: Admin can sign in Microsoft 365 Admin center > Support > New Service Request, type some words in search field and perform search > click “Contact Support” at the bottom: Online support. Thank you for your time and understanding.
Sincerely,
Etta Ma MSFT | Microsoft Community Moderator
***Note: In the event that you're unable to reply to this thread, please ensure that your Email address is verified in the Community Website by clicking on Your Account Name > "My Profile" > "Edit Profile" > Add your Email Address > tick "Receive email notifications" checkbox > click on "Save”. ***