Visual Studio 2015 or 2017 shows IntelliSense errors but solution compiles

I had thousands of intellisense errors and 0 build errors. After deleting .suo file and restarting VS intellisense errors are gone.

Suo file is located relatively to source in:
.vs\SolutionName\v14\.suo

According to comment: Beware that *.suo is a hidden file.

Edit: According to comments, VS2017 has the same issue, so you can use similar solution: Delete .vs\SolutionName\v15\.suo

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