Windows
Outlook was slow and freezing until Cached Exchange Mode and updates were applied
Outlook was running slowly and freezing, especially when forwarding emails with attachments. The technician repaired Microsoft Office, installed the latest Outlook updates, and enabled Cached Exchange Mode, which made forwarding work quickly.
Killed once by someone from XL.net, on 2025-11-11.
Affects
Versions
- Windows
Apps
- Outlook
What you see
- Outlook was very slow
- Outlook would freeze or lag while loading mail
- Forwarding emails with attachments took a long time
Why it happens
Likely Outlook was likely affected by being out of date and not using Cached Exchange Mode.
When it shows up
Outlook is slow or freezes, and forwarding mail with attachments is delayed.
You are in this case if:
- Cached Exchange Mode is disabled in the account settings
- Outlook updates are not current
1 fix below
The steps that killed it
The steps are behind a quick check
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Someone from XL.net killed this on a Windows computer on 2025-11-11. It is written up from that one repair, so it cites no outside page.