If you purchased from a third-party retailer try searching the retailer's name. If you purchased Office 2010/2013 directly from Microsoft, search for 'Microsoft' in your emails. You may also be able to recover the Office product key in the confirmation email you received if you purchased the product online.

The account details page will contain the product key and provide a download link to install Office. To recover the product key, go to Microsoft's My Account and sign in with the Microsoft account tied to the install.

This option is available if you purchased, downloaded, and installed Office 2010/2013 online, or at one point, the product key was associated with a Microsoft account. You may be able to recover the Microsoft Office product key online. If you bought the box product at a store and you haven't installed Office 2016 yet, the product key can be found in the packaging.

If you continue to have problems signing in to your account page, contact Microsoft support to review your options. There are many other alternatives, but these are some of the best.If you sign in to your account page with a Microsoft account that's not linked to your subscription, you'll get this message: ' Office isn't associated with this account.' You'll need to sign in with the Microsoft account that was used when you redeemed and installed Office for the first time. Unlike Microsoft’s Office web apps, you can even access Google Docs, Sheets, and Slides offline in Google Chrome. It stores your files in Google Drive, Google’s online file storage service.

Google Docs is a capable collection of web-based office software.

Windows PC users can access a web-based version of iWork through the iCloud website, too. This is Apple’s competitor to Microsoft Office, and it used to be paid software before Apple made it free.

Apple iWork is a free collection of office applications for Mac, iPhone, and iPad users.

You can even make LibreOffice look like Microsoft Office. While OpenOffice is still around, LibreOffice has more developers and is now the more popular project. It’s similar to the desktop versions of Microsoft Office, and it can even work with and create Office documents in common file types like DOCX documents, XLSX spreadsheets, and PPTX presentations.

LibreOffice is a free and open-source office application for Windows, Mac, Linux, and other operating systems.There are completely free office suites that sport good compatibility with Microsoft Office documents, spreadsheets, and presentation files. If you’re looking for something else, consider choosing a different office application.

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