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Microsoft 365 Application

Microsoft Project

Use this guide when you cannot open a Microsoft Project (.mpp) file, Project for the web is empty, or you are not sure which Project license you actually have.

Reviewed April 2026

Application Guide

Overview

There are three different Microsoft Project products: Project Professional (desktop, opens .mpp files), Project for the web (browser at https://project.microsoft.com), and Project Online (the older PWA-based product).

Most Project tickets are confusion about which product is licensed and installed — Project is not part of standard Microsoft 365 Apps and must be assigned separately.

Plain English

What this app is usually used for

Project scheduling workflow covering Project desktop (MPP files), Project for the web, and Planner-based project plans.

It is part of the Microsoft 365 family covered in our app help.

Common problems

Common problems

Cannot open an .mpp file

You double-click an .mpp file but nothing happens or Windows asks which app should open it.

Likely fix

Confirm you have Project Plan 3 or 5 assigned and that Project Professional is installed from your Office 365 portal — Project Professional is not part of Microsoft 365 Apps.

What to collect

Send the .mpp file path, your Project license if you know it, and whether Project Professional appears in your Start menu.

Project for the web is empty or won't open

You open https://project.microsoft.com but cannot create plans or see your work.

Likely fix

Confirm a Project license is assigned to your account in Microsoft 365 account center, then try a fresh browser profile.

What to collect

Send your work account, the Project license assigned, and a screenshot of the project.microsoft.com page.

Project Online (PWA) site won't load

You cannot reach the Project Online site for your team.

Likely fix

Confirm the PWA URL your team uses, that you are a member of that PWA site, and that Project Plan 3 or 5 is assigned.

What to collect

Send the PWA URL, your account, the exact error, and your Project license.

First things to try

First things to try

Quick checks before you change anything

  • Are you trying to open an .mpp file, create a plan in https://project.microsoft.com, or reach a Project Online (PWA) site?
  • Has your IT or support team assigned you Project Plan 1, Project Plan 3, or Project Plan 5?
  • Did the issue start after a license change, role change, or new computer?
  • Does another Project user with the same license see the same problem?

Try these fixes first

  • Confirm with your IT which Project license is assigned to you before assuming the install is broken.
  • Test https://project.microsoft.com in a fresh browser window to isolate Project for the web from desktop Project issues.
  • If you only have Plan 1, you cannot open .mpp files — the file needs to be re-created in Project for the web or opened by someone with Plan 3.

Slow down

Do not do this yet / warnings

Avoid these until support says it is safe

  • Collect exact error wording, organization, affected apps, web-versus-desktop behavior, and recent password, multi-factor sign-in, or device changes before Tier 2 takes over.
  • Do not reset OneDrive or recreate Outlook profiles until permissions, licensing, and organization selection are confirmed.
  • Preserve any MPP files and published project plans before removing the desktop app, and reassign ownership in Project for the web before deactivating the user.

What support needs

What details support needs

Send these details

  • A screenshot of the issue (the missing Project app, the empty project.microsoft.com page, or the PWA error).
  • Your work account email.
  • The Project license you believe is assigned (Plan 1, 3, or 5), if you know it.
  • The exact .mpp filename and path, if applicable.

Licensing & access

Licensing / access notes

Licensing / access checks

  • Project Plan 1 unlocks Project for the web only. Plan 3 unlocks Project for the web plus Project Professional desktop and Project Online. Plan 5 adds portfolio features.
  • If you double-click an .mpp and nothing happens, you likely do not have Project Professional installed — it does not come with Office or Microsoft 365 Apps.
  • Project for the web access requires a Project license assigned in Microsoft 365 account center, even if the rest of Microsoft 365 works.

More checks

More setup checks

Install / update basics

  • If you have Project Plan 3 or 5, install Project Professional from your Office 365 portal at https://portal.office.com under Apps & devices.
  • For Project for the web, simply browse to https://project.microsoft.com and sign in with your work account.
  • For Project Online (PWA), open the PWA site URL your team gave you and sign in with your work account.

More things to check

  • Confirm the exact Project license in Microsoft 365 account center before reinstalling anything on the computer.
  • For .mpp files, check whether Project Professional is actually installed (it is not part of standard Microsoft 365 Apps).
  • For Project for the web, test sign-in at https://project.microsoft.com in a fresh browser profile before troubleshooting.