What is a Microsoft Office 2019 bind key? Basically, it is a product key which binds a Microsoft account to the software. With it, you can install Office on one or more PCs and reinstall the software on another PC for as many times as you need. The bind key is compatible with both Mac and Windows-based operating systems. This product key is 100% updatable and valid for all versions of Office, including Word, Excel, PowerPoint, OneNote, Access, Publisher, and Skype for Business. The Office 2019 Professional Plus bind key enables you to activate the software for a lifetime on one PC. It is also bound to your Microsoft account and is therefore non-transferable. The product key is valid for all Windows versions, 32- and 64-bit, and supports all languages, regions, and editions. It can be used on only one computer. Office 2019 Professional Plus bind key is a digital license code that has no expiration date. The office bind key will activate the software for one user only. The bind key is compatible with all applications.