I recently upgraded my Samsung I5 laptop to Windows 10.  I attempted to make a movie with Windows Live Movie Maker (WLMM), which I assume was installed / upgraded as part of the Windows 10 upgrade.

As long as I am making a movie consisting only of still photos, everything works fine.  But when I tried to include an MOV file from my iPhone 6, WLMM gave me an error code (file corrupted).  I think the error code was 87260103.

I took the MOV file to a Vista PC and converted it to WMV format, and then brought the WMV file back to my Windows 10 PC. Windows media player on Windows 10 can play the WMV file just fine, but when I import it to WLMM, I still get the same error code (file corrupted / not readable).  What gives?

Out of desperation I installed Windows Essentials 2012 in order to get Windows Movie Maker (WMM) which looks the same as WLMM but is obviously different.  Using WMM on Windows 10, I can include my MOV and WMV video files into a project without errors.   In other words, WMM (from 2012) works better than the WLMM that was installed/upgraded as part of Windows 10.

When you ask questions about WLMM and Windows 10 on the support website, you get a jumbled mess of useless answers related to both WLMM and WMM on windows Vista, Windows 7, Windows 8, etc.  

My questions to the community (and Microsoft) are:

(1) Why does WMM from 2012 work better than the WLMM installed as part of Windows 10? 

(2) Which is the preferred movie maker for Windows, going forward - WMM or WLMM?  

(3) Is WLMM going to be fixed / upgraded, or should I just delete it?  Has it been discontinued and I did not get the memo?

(4) When I search the support website about a problem on Windows 10, why do I have to plow through useless answers that date back to 2010 and even Windows Vista?