Dear @Laura MacLeod,
Thank you for posting your question in the Microsoft Q&A forum.
Based on your description, your work email in the left-hand side bar under groups disappeared and you try search your work email it doesn't come up. For better understand your situation, could you please provide us more detail information as:
- Which version of Outlook you're using getting that issue? (New Outlook, Classic Outlook, Web version or Desktop app?)
- Does the same issue occur in others user's device or only in yours?
- Does this happen only for Groups, or also for shared mailboxes and regular folders?
- Have you tried searching via Outlook on the web to check does it work there?
- Did you recently update Outlook, change account settings, or disable cached mode?
The more detail information you provide, the more effective we could find the solution for you.
Looking forward to your update.