: At its launch, it was unique for being the only mobile version that allowed users to upload video directly from their phone. Troubleshooting (Historical)

Windows Mobile 6.1 is over 15 years old. Facebook has since switched to:

While the original .cab installation files may still exist in unofficial web archives, the app itself will not connect to Facebook's modern servers even if successfully installed. Recommended Alternative: Mobile Browser

Allowed users to call or SMS friends directly from their Facebook profile page within the app. Performance & UI: Ease of Use:

The servers that app talked to simply don't exist anymore.