Hi Amelia Egerer,
Welcome to the Microsoft Q&A forum.
I understand how worrying it can be to lose your contact list after an update, especially when you rely on those contacts regularly.
I see that there is already a Q&A Assist answer in this thread. The steps provided there are generally correct for Classic Outlook for Windows, particularly for checking Deleted Items and Recoverable Items. Have you had a chance to try those steps yet? From the forum side, contributors can help guide you through available recovery options, but there is no access to account‑level data or backend recovery tools.
In addition to what was already suggested, you may want to check the following to rule out common scenarios that do not involve permanent data loss:
- In Outlook, switch to the People or Contacts view and review all available Contacts folders, as contacts may still exist under a different folder after an update.
- If you use a Microsoft account, sign in to Outlook.com in a web browser and open the People section. If contacts appear there, the issue may be limited to local synchronization in Outlook for Windows.
If the contacts are not available in any folder, not visible on Outlook.com, and not recoverable using the steps already outlined by Q&A Assist, it is important to note that recovery options may be limited. In this situation, the next appropriate step would be to contact Microsoft Support so the account can be reviewed at the service level and confirmed whether any remaining recovery options are available.
- Visit the Microsoft Support contact page: Contact - Microsoft Support
- In the search bar provided on the page, type "Outlook issue" and press Enter.
- Click on the "Get Help" button that appears.
- Scroll down the page until you see and click on the "Contact Support" option.
- When prompted to select your product or service, choose "Other Products".
- For the category, choose "Outlook".
- Look for and click on "Chat with a support agent in your web browser".
- Confirm your personal email when prompted - this is the email Microsoft will use to communicate with you during and after the support session.
- Explain your situation clearly: Be concise but provide all the relevant details.
I hope this helps clarify where to check for the missing contacts and what the next steps could be.