Miscellaneous topics that do not fit into specific categories.
To replicate your previous setup with separate email stores and separate user identities for you and your wife, you should use Microsoft 365 Family or a perpetual license like Office Home & Business. MS 365 Personal only supports one user profile.
The short answer to your question is no, you cannot easily run two separate email stores under a single Microsoft 365 Personal subscription. That version is licensed for exactly one person. Your email provider accounts do not need to be Microsoft-registered emails to set up stores in Outlook. However, a Personal subscription will only let you configure one primary set of Office credentials on the machine.
Microsoft 365 Family is likely the best option for your specific situation. This version covers up to six users. You can purchase and own the subscription as the administrator. Then, you send a sharing invite to your wife’s personal Microsoft account. Once she accepts, you both get separate Outlook setups, separate document stores, and one terabyte of individual cloud storage.
Office Home & Business 2024 is your other viable option. If you prefer a one-time purchase without monthly or yearly subscription fees, this version of Office allows for Outlook use. It is licensed for use across one computer. You would just need to set up your two different Windows User accounts on the laptop to keep your email stores separate.
The shop should have steered you toward Microsoft 365 Family if you wanted the benefits of regular feature updates. If you prefer to own your Office software permanently without a subscription, they should have sold you Office Home & Business.
To fix this, you should contact the retailer to return or exchange the Microsoft 365 Personal license. Once you have the right software, you can continue using your two local Windows user IDs. You will still be able to save your shared Word and Excel files to your network storage just like you always did.
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hth
Marcin