Before anything else: Microsoft uses "managed" and "unmanaged" for two completely unrelated things, and mixing them up is the single most common way this topic gets confused. Inside Partner Center's deal registration and referral workflow, a "managed" or "unmanaged" customer account describes whether a specific end-customer account is already assigned to a Microsoft seller's territory, a property of the customer, decided deal by deal.
This brief is about a different thing entirely: a partner's own relationship status with Microsoft. A Managed partner is one Microsoft has assigned a dedicated human contact, a Partner Development Manager (PDM) or equivalent role, to manage. An Unmanaged partner has no assigned Microsoft contact and interacts with the ecosystem through Partner Center, documentation, and self-service programs only. Same two words. Different layer of the system. Neither Microsoft nor most partner-facing content bothers to say which one it means, and that is the root of most of the confusion partners carry into this topic.
From this point forward in this brief, "Managed" and "Unmanaged" refer only to the partner-relationship meaning, capitalized to keep the distinction visible.
If you have seen guidance on checking whether a customer account shows up as "Microsoft Managed" inside Partner Center's Referrals → New Deal flow, that is the account-assignment meaning above, confirmed current against Microsoft's own documentation. It tells you whether Microsoft's sales team already has a relationship with that customer. It does not tell you whether you, the partner, have Managed status. Same search, same two words, still a different question.