How Can I Identify All Installed Microsoft Office Versions, Including Specific Excel Versions?

Determining Your Microsoft Office Installations

Problem:

How can you identify the precise versions of Microsoft Office, especially Excel, installed on your system, particularly if multiple versions are present?

Solution:

Several methods exist to determine your installed Office versions:

• Registry Key Inspection: Examine registry keys like "HKLMSoftwareMicrosoftOffice12.0WordInstallRoot::Path" (for Word 2007 as an example). The path within the key reveals the application's location. This approach is useful for older, MSI-based installations.

• MSI Database Query: Leverage the MSIEnumProducts API to directly query the Windows Installer database for installed Office products.

Handling Multiple Office Versions:

Microsoft doesn't officially support simultaneous installations of different Office suites. However, if multiple versions exist, the following considerations apply:

Office 2019 and Office 365 (and later):

These versions utilize Click-To-Run installation, abandoning the older MSI method. Consequently, registry keys and Application.Version values might consistently display "16.0," regardless of the actual version. Examining the file version of winword.exe can offer hints, but this number also increases with updates, even within the same major version (e.g., Office 2016).

Pinpointing Excel Versions:

Because multiple Excel versions can coexist (though unsupported), checking the file version of winword.exe using tools like FileVersionInfo (in .NET) or similar system utilities provides a more reliable way to determine the specific Excel version installed.

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