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Outlook 365 is very slow

Evgeny Shupik 191 Reputation points
2022-02-22T14:47:36.127+00:00

Hello! Need some help - faced with some trouble while using Outlook 365 - it's downloading messages VERY slowly and it no depends of network connection. I already try to create new mail profile - there is no any effect, Inbox (approx 4 Gb) downloading is about 5-6 hours!!! It looks like I'm using DialUp :-D In spite of it Web version of mailbox is OK, iOS version is also normal. How to fix it if it's possible? Thank you for any advice.

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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  1. ChristyZhang-MSFT 23,146 Reputation points Microsoft Vendor
    2022-02-23T03:55:42.803+00:00

    Hi @Evgeny Shupik ,

    Welcome to our forum!

    What's the version of your Outlook? (File > Office Account > About Outlook). please make sure you have upgraded your Outlook to the latest version.
    And what's the type of your account(POP/IMAP/Exchange)?

    To further confirm whether the problem is only related to the Outlook client, please try configuring your account in Mail and check whether there is the same problem.

    If everything works in mail, considering the impact of some add ins, It is suggested that you try to start outlook in safe mode(win+R>type: outlook /safe) to check whether it works normally.

    If the issue still exists, considering any errors in your register may also cause it, please try to rename your Outlook register key(Location: Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook, rename it to Outlook1), then restart your Outlook and readd your account for testing.
    (Note: Serious problems can occur if you modify the registry incorrectly. Before making changes, back up the registry to restore it in case something goes wrong.)

    Hope the above help!

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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  2. Evgeny Shupik 191 Reputation points
    2022-02-24T12:31:00.627+00:00

    Outlook version is 2201 (build 14827.20198), connection type Microsoft Exchange (MAPI as far as I understand). Already tried to make a new mail configuration - no results.

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