How to clear cache in Outlook: new app and classic version

This guide explains how to clear your Outlook cache to improve performance and fix common problems. Outlook uses a cache to store temporary data like emails, attachments, and calendar events. Over time, this cache can become bloated and cause slowdowns, syncing errors, or display problems. Clearing it helps resolve these issues.

- What is Outlook Cache?

• Why Clear Your Outlook Cache?
• Effects of Clearing Outlook Cache
• Clearing Cache in Classic Outlook
• Alternative Cache Deletion Method (Classic Outlook)
• Clearing AutoComplete Cache
• Clearing Cache in the New Outlook
• Cache Management Tips

What is Outlook Cache?

The Outlook cache is a collection of temporary files on your computer that lets Outlook quickly access frequently used data. This includes emails, attachments, calendar entries, and contacts. This speeds up Outlook by reducing the need to constantly fetch data from the server. Cache types include temporary files, autocomplete cache, and the Offline Outlook Data File (.ost) for Exchange, Microsoft 365, and IMAP accounts.

Why Clear Your Outlook Cache?

While caching improves speed, a large or corrupted cache can cause:

• Slow performance
• Synchronization errors
• Update problems
• Corrupted files

Effects of Clearing Outlook Cache

Clearing the cache forces Outlook to download fresh data and rebuild the cache. This fixes outdated information, syncing errors, and glitches.

Clearing Cache in Classic Outlook

(Applies to Outlook 365, 2021, 2019, 2016, and earlier versions)

1. Close Outlook.
2. Press Windows R, type %localappdata%\\Microsoft\\Outlook\\RoamCache, and press Enter. This opens the RoamCache folder (typically located at C:\\Users\\{User name}\\AppData\\Local\\Microsoft\\Outlook\\RoamCache).

3. Select all files (Ctrl A), then press Delete.

4. Restart Outlook.

Alternative Cache Deletion Method (Classic Outlook)

1. Open Outlook.
2. Go to File > Account settings > Account settings.
3. Select the account and click Open File Location.

4. Locate and open the RoamCache folder.
5. Close Outlook.
6. Delete all files in RoamCache.

Clearing AutoComplete Cache

1. In Outlook, go to File > Options.

2. Select Mail.
3. In the Send messages section, click Empty Auto-Complete List.
4. Confirm the action.

Clearing Cache in the New Outlook

1. Close Outlook.
2. Press Windows R, type outlook.exe --devtools, and press Enter.

3. Open the DevTools window, click Application.
4. Under Storage, right-click https://www.php.cn/link/1eea799a567e662fdef936de36dd6ab4 under Local Storage and select Clear.
5. Repeat for Cookies.
6. Close DevTools.

Cache Management Tips

• Use Cached Exchange Mode.
• Regularly clear temporary files and the AutoComplete list.
• Consider deleting the .ost file (back up first!).
• Use the Outlook Repair Tool (ScanPST.exe) if problems persist.

Regular cache maintenance keeps Outlook running smoothly.

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