A list of currently known missing versions/versions we're looking for of Skype for Windows:

- Any official MSI installer for Skype 4 (no extracted ones, and installers other than 4.0.0.226 & 4.1.32.179)
- Any AppxBundles or installers of Skype UWP
- Any Excite-Skype EXE version
- Any Daesung-Skype version
- Skype 0.90.0.10 Beta
- Skype 0.91.0.2 Beta
- Skype 0.93.1.1 Beta
- Skype 0.94.0.19 Beta
- Skype 0.94.0.28 Beta
- Skype 0.95.0.25 Beta
- Skype 0.95.0.36 Beta
- Skype 0.95.0.40 Beta
- Skype 0.96.0.1 Beta
- Skype 0.97.0.1 Beta
- Skype 0.97.0.3 Beta
- Skype 0.97.0.6 Beta
- Skype 0.98.0.04 Beta
- Skype 0.98.0.68 Beta
- Skype 1.0.0.9
- Skype 1.0.0.10
- Skype 2.6.0.74 Beta
- Skype 3.0.0.106 Beta
- Skype 3.0.0.123 Beta
- Skype 3.0.0.137 Beta
- Skype 3.5.0.107 Beta
- Skype 3.5.0.178 Beta
- Skype 3.5.0.202
- Skype 3.8.0.144
- Skype 4.0.0.155 Beta (Used to be available on FileHippo in the early 2010s, download server not archived)
- Skype 4.0.0.166 Beta (Used to be available on FileHippo in the early 2010s, download server not archived)
- Skype 4.0.0.168 Beta (Used to be available on FileHippo in the early 2010s, download server not archived)
- Skype 4.0.0.169 Beta (Used to be available on FileHippo in the early 2010s, download server not archived)
- Skype 4.0.0.181 Beta (Used to be available on FileHippo in the early 2010s, download server not archived)
- Skype 4.1.0.130 Beta (Available in deobfuscated form, online installer available, obfuscated offline installer missing)
- Skype 4.1.0.136 (Online installer available, offline installer listed as 4.1.0.136 on other sites, is actually 4.0.0.226)
- Skype 4.2.24.169 (Online installer available, offline installer missing)
- Skype 5.5.59.124 (Online installer available, offline installer missing)
- Skype 5.6.59.110 (Online installer available, offline installer missing)
- Skype 5.7.0.137 Beta (Online installer available, offline installer missing)
- Skype 5.9.66.114 (Available in deobfuscated form, obfuscated offline installer missing)
- Skype 6.0.66.120 (Online installer available, offline installer missing)
- Skype 6.10.66.104 (Online installer available, offline installer missing)
- Skype 6.11.66.102 (Online installer available, offline installer missing)
- Skype 7.18.66.112 (Online installer available, offline installer missing)
- Skype 7.21.66.100 (Online installer available, offline installer missing)
- Skype 7.29.66.101 (Online installer available, offline installer missing)
- Skype 7.29.66.102 (Online installer available, offline installer missing)
- Skype 7.33.66.104 (Online installer available, offline installer missing)
- Skype 7.34.66.103 (Extracted MSI available, offline installer missing)
- Skype 7.36.66.101 (Installed copy & online installer available, offline installer missing)

If you have any of these versions and/or know where to find them, please contact me.

- WinReset