We purchased Microsoft Office Licenses from our IT Support Company in 2023 but now our Microsoft is not working. My PC has reverted back to a Student version thereby taking away my OUTLOOK. We are a business and we cannot operate like this.

The behavior described indicates an activation/licensing problem, not a technical failure of the Office apps themselves. The only supported resolution paths in this situation are:

1. Verify the correct account and license
   • On each affected PC, open any Office app (for example Word) and check the title bar. If it shows Unlicensed Product or similar, activation has failed and most features are disabled.
   • Go to File > Account (or Office Account) and check which email address is shown under User Information and which product is shown under Product Information.
   • If prompted to sign in, sign in with the account that actually owns the Office license. If the wrong account is used, Office will show messages like “We couldn't find any Office products.”
   • If the account in use does not show a valid business license that includes Outlook, the installation will behave as a non‑licensed or reduced product and can fall back to a different edition (for example a preinstalled Home & Student/Student version that does not include Outlook).
   This step is required because activation errors and “Unlicensed Product” states are caused by missing or invalid licenses, or by signing in with an account that does not own the product.
2. Confirm what was actually purchased
   • The invoice alone is not sufficient to restore activation. The key information needed is:
     • The exact product names (for example, Microsoft 365 Business, Office Home & Business, Office Professional, etc.).
     • The activation method (product keys vs. Microsoft 365 subscription assigned to specific accounts).
   • The context indicates that some Office editions (for example Home & Student) do not include Outlook, while others do. If the PCs are now activating against a Home & Student–type license, Outlook will disappear because that product does not include it.
   • If the licenses were volume licenses (for example “Professional Plus”), they are not consumer licenses and must be managed by the organization that owns the volume agreement.
3. Recover or re‑issue the licenses/product keys
   • If the licenses were sold as perpetual “lifetime” product keys, those keys are required to reinstall or reactivate Office on each PC.
   • If the keys cannot be found, Microsoft support cannot reconstruct them from an invoice alone. The seller (IT support company or reseller) must provide the keys or otherwise prove and restore the licensing.
   • If the seller cannot or will not provide valid keys or account assignments, the only supported option is to purchase new licenses from Microsoft or another authorized reseller.
4. If Outlook or Office shows as unlicensed
   • Follow the standard activation troubleshooting:
     • Open an Office app and go to File > Account.
     • Confirm that the signed‑in account is the one that owns the license.
     • If activation still fails and the product shows as Unlicensed Product, use the guided support tool referenced in the activation article to diagnose and fix activation issues.
5. When Outlook specifically is missing
   • If the current license on the PC is an edition that does not include Outlook (for example, Office Home & Student), Outlook will not be available.
   • To restore Outlook, one of the following is required:
     • Activate with a license that includes Outlook (for example, a business or Home & Business/Professional license), or
     • Purchase a plan or product that includes Outlook and install/activate it on the affected PCs.
6. Next actions for this scenario
   • Collect from the IT support company:
     • The exact product names and license types sold in June 2023.
     • The product keys or the Microsoft accounts/tenant where those licenses were registered.
   • On each PC, sign out of all Office accounts, then sign in only with the account that actually owns the business license, and let Office reactivate.
   • If the IT company cannot supply valid keys or account assignments, obtain new business licenses (for example Microsoft 365 business plans that include Outlook) and assign them to the appropriate user accounts, then reactivate Office on each PC.

Without valid, traceable licenses or product keys, Outlook and the rest of the Office suite cannot be legally or technically re‑enabled beyond trial or student editions.

References:

• Unlicensed Product and activation errors in Office
• Office error "The products we found in your account can't be used to activate"
• Where can I get a new license for my Outlook account?
• Office Home and Student 2021 issue - Microsoft Q&A
• Office not working on newly purchased Acer - Microsoft Q&A
• problem with active office key - Professional Plus Office 2024 - Microsoft Q&A

What is the specific name of your Office product? Microsoft Office Professional 2021? Something else?

Since you have a business product, try Microsoft business support. Go to https://support.microsoft.com/en-us/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2 .