After this, restart Outlook and clear the cache by following the methods mentioned above.

Under Microsoft Exchange Server, check the “ Use cached exchange mode” checkbox.Now, on the E-mail tab, click the Exchange Server account, and then click “ Change.”.Go to the Tools menu and click Account settings.Method 3: If none of the above methods work for you, then try to clear server-side cache by loading Outlook in Online mode. ( Note: To use this method, make sure that you’re logged in with Outlook) With the help of this method, you don’t have to go through the hassle of clearing auto-complete store manually. Now, type “ Outlook.exe /CleanAutoCompleteCache” in the field and hit “ Ok.”.Press “ Window + R” to start the “ Run” command.Method 2: This method includes the use of cmd command to start Outlook, and then clear the Auto-complete store. This is the easiest way to clear the Auto-complete store. A notification window will appear on the screen to confirm your action.Now, select the “ Mail” tab, go to “ Send Messages” area and click “ Empty Auto-Complete list.”.Open Outlook and go to the “ File” tab and select “ Options.”.Method 1: The first method includes clearing the Auto-complete store through the Outlook app. Below we have mentioned each method in detail. Now, there are different ways to clear the Auto-complete store of Outlook. This error can only be resolved by clearing the Outlook Auto-complete store. One of the main reasons behind this error could be a corrupted address in the Auto-Complete store. If you’ve ever faced “ AutoComplete doesn’t save email addresses” error in Outlook, then you might know how annoying it is to get rid of it. “Whenever I restart Outlook, the AutoComplete cache is completely empty again.” – John Mavic reported a complaint on Microsoft forums.

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