I'm one of the "If it ain't broke, don't fix it." kind of people, and consequently I've only used FSX boxed (which has never given me an OOM). I've had a few CTD's but these were caused by badly written addons which needed the offending .blg file to be decompiled and corrected.

I have both FSX Acceleration and FSX:SE installed and am in the processing of migrating my favorite things over.  The only issue I'm having is trying to remember what I did to FSX:A to get certain effects.  For example, I added or tweaked something in FSX:A to make my runways and taxiway lights more realistic.  In FSX:SE, I still have the blurry lights.  So it's not a problem with FSX, it's my own memory I'm running out of.  Speaking of memory, the main reason I am moving over to FSX:SE is because my FSX:A is locking up on about 75% of my flights.  I've tried some of the tweaks offered here but none have resolved the problem.  I'm very grateful to everyone out there who has taken the time to analyze our problems and come up with solutions.  Thank you.

Edited:  My profile says New Member and I've posted four times.  I've been simming since Sublogic's Commodore 64 software.  I even did a stint with ATP in the early 90s.  I've always researched to find solutions which is why I'm grateful.