Member Avatar for eileenmcm

Hi, my Outlook will not open after downloading and running the latest service packs yesterday. Outlook opens into a tiny window, first it said Microsoft SEtup Bootstrapper is not working, now it only opens in a tiny window and then closes saying, cant open Outlook. Tried uninstallating service packs through windows updates, but no different, any ideas please.

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’s follow-up points to a classic, well‑documented cause: a corrupted Navigation Pane can make Outlook open oddly and then refuse to start, and resetting the Navigation Pane often restores normal startup. (support.microsoft.com)

Useful next steps that avoid a full OS reinstall (ordered from least to more invasive): start Outlook in Safe Mode to rule out add‑ins (outlook.exe /safe); if Safe Mode works, disable COM add‑ins and re-enable them one at a time to find the culprit. If Safe Mode does not help, create a new Outlook profile to check for profile corruption. (support.microsoft.com)

If data corruption is suspected (Outlook opens briefly or shows folder errors), run the Inbox Repair tool (scanpst.exe) against the PST/OST files and consider repairing the Office installation via Apps & Features → Modify → Repair (Quick or Online Repair). Back up any PST files or exported data first before running repairs. (support.microsoft.com)

For diagnostics, check the Windows Application log (Event Viewer) and Reliability Monitor for timestamps and error codes that correspond to the crash — these clues help decide between add‑ins, corrupted data, or an install problem. ’s suggestion to back up data is sound; reinstalling Windows should be a last resort after data has been secured and the Office/Outlook‑level repairs above have been attempted. (learn.microsoft.com)

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Member Avatar for gurukid22

Hi There

Provided you are using a valid(licensed) version of windows the best thing to do would be to backup your data using free backup software i recommend DMailer Backup from then reinstall windows.

Good Luck

Member Avatar for eileenmcm

Hi Thanks, it is all legal software, the answer lay as follows;

Start Outlook with the resetnavpane switch;
Start-> Run; outlook.exe /resetnavpane
(note the space in the command)

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