Hence, this is the first thing you should check.

Step 1:initiate the Outlook app and click theFilemenu in the top left corner.

Step 2:SelectOptionsfrom the left sidebar.

Outlook File Menu

Step 3:In the Outlook Options window that opens, switch to theMailtab.

Step 5:ClickOKto save the changes.

Heres how you might change that.

Outlook Options

Step 1:In the Outlook app, expandContactsfrom the left pane.

Step 2:Right-press the problematic contact folder and selectProperties.

Step 4:HitApply, followed byOK, to save changes.

Mail Tab in Outlook Options

However, these add-ins can sometimes conflict with the Outlook app and prevent it from working correctly.

Press theWindows key + Rto launch the Run dialog.

bang out inoutlook.exe/safeand pressEnter.

Enable Autocomplete in Outlook

If Outlook displays your contacts in safe mode, the add-in causing the problem was disabled.

To find it, you better disable all your add-ins and re-enable them one by one.

Step 1:pop fire up Outlook app in normal mode and go toFile > Options.

expand Contacts from the left pane

Step 2:In the Outlook Options window, navigate to theAdd-instab.

Use the drop-down menu next to Manage and selectCOM Add-ins.

Then tap on theGobutton next to it.

Outlook Contact Folder Properties

Step 3:Uncheck the boxes to disable add-ins and clickOK.

Enable all your add-ins one at a time until the issue occurs again.

Once you find the problematic add-in, consider updating or removing it to deal with the issue for good.

Show Outlook Contact Folder in Address Book

While thats a good thing, Outlook cache data can also cause problems once it becomes old or corrupted.

Step 1:Press theWindows key + Rto launch the Run dialog box.

punch in the following path in the Open field and pressEnter.

Outlook Add-ins

It can automatically resolve issues with all your Office apps, including Outlook.

Step 1:Right-tap on theStart iconand selectInstalled appsfrom the list.

Step 2:Scroll down to locate the Microsoft Office product on the list.

Uncheck the boxes to disable add-ins

Click thethree-dot menuicon next to it and selectModify.

Step 3:SelectOnline Repairand clickRepair.

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