>>>Can someone refresh my memory of what could be going on here.
>>>
>>>I have a client and they said they said in one Form (one table) they are missing all records between May 1, 2019 and the end of August 2019. Over the phone with me they don't seem there. I had them send me a copy of their data folder, and use/browse that table I do see all the records.
>>>
>>>It seems like a few years ago that windows was somehow making a "ghost" copy of data, and so a program might not be actually writing to the real data.
>>>
>>>Can someone help refresh my memory what the issue could be on this. It might have something to do with a Regedit setting.
>>
>>In addition to Al's suggestions:
>>
>>- Could deleted records be involved somehow?
>>- In recent versions of Windows, if you store data in the Program Files hierarchy, it gets actually put elsewhere and that can lead to some confusion. Doug wrote about that here: http://doughennig.com/papers/Pub/Vista.pdf
>>
>>
>>Tamar
>
>I suspect it is a Virtualization issue (I couldn't remember the term - thanks for Doug's link) in particular with this. I'm getting a little rusty as I am now nearly a 100% consultant/developer with Salesforce.
>
>All their data is in fact good, but not from with their app as I now have a copy of it.
>
>Thanks for your help....

I wouldn't consider Vista-style virtualization as a likely cause of what you're seeing:

- I'd expect that to interfere with access of all rows, not just some of them
- If it's a multi-user app with data stored on a file share somewhere, that share is not subject to virtualization