On the next window prompt, select your Outlook profile under the Email tab.

Now, in the right pane, click Account Settings and select the Account Settings option.

Generally, it happens when you have a large number of subfolders/items or a corrupt PST file. When your Outlook profile gets corrupted, you can face the Outlook loading slow issue.

Check if Outlook is loading the messages more quickly.

Click OK when done and close all the open windows.

Repeat steps 2 and 3 if you have multiple pst files.

Under the Data files tab, select a PST file and click Settings above it.

Launch the Outlook app and navigate to File > Info > Account Settings > Account Settings.

However, if you use PST files to store your mailbox data, you need to shrink their size manually. You can sort and remove/delete the large files manually or use the “mailbox cleanup” feature to empty your mailbox. This can cause Outlook messages to load extremely slowly. If you send/receive a large number of emails, chances are your mailbox is almost full.

Alternatively, you can even remove an add-in by selecting it and clicking the Remove button.

Now, uncheck the checkbox for each add-in you want to disable.

Now, in the right pane, select the COM Add-ins option next to the Manage field.

Select the Add-ins tab from the sidebar.

Open Outlook and navigate to File > Options.

Here’s how to disable/remove add-ins in the Outlook app. Some users have reported the antivirus add-in causing the issue, so disabling it could solve your problem. After that, you can remove it from the Outlook app.

Therefore, you should remove the unused/faulty add-ins and only keep the essential ones that you frequently use.Īlso, to know if a particular add-in is causing the issue, disable the add-ins one by one until you find the problematic one.

And if it works as expected, the add-ins are probably faulty. To know if add-ins are causing issues, you can even run Outlook in safe mode. Remove Add-InsĪdding too many add-ins can slow down the Outlook app and thus result in your messages loading too slowly.įurthermore, some add-ins might be corrupt or incompatible and cause issues by interfering with the app. If Outlook continues to load slowly, you can go through the following fixes. On the other hand, make sure your network connection isn’t slow and is stable. So, try disabling the firewall temporarily and see if it solves your problem. Regardless, enable it as soon as possible to protect your system from various threats and malware. Outlook mailbox almost full or running out of storageīefore you move on to the technical fixes, check if your system meets the minimum requirements to use Outlook on your system.Īlso, the antivirus software can sometimes have false negatives and interfere with the Outlook app.While multiple factors can lead to this issue, some of the most possible ones are as follows.

Outlook 365 running slow on mac