Is the StarTech.com MDP2VGA2 Mini DisplayPort to VGA Adapter compatible with Thunderbolt devices?

Yes, it is compatible with Intel Thunderbolt devices that are capable of outputting a DisplayPort signal.

What is the maximum resolution supported by the StarTech.com MDP2VGA2 Mini DisplayPort to VGA Adapter?

The maximum resolution supported by the adapter is 1920x1200 / 1080p.

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StarTech.com MDP2VGA2 Mini DisplayPort to VGA Adapter - DisplayPort 1.2 - 1080p - Thunderbolt to VGA Monitor Adapter - Mini DP to VGA

Connect a Mini DisplayPort 1.2 equipped PC or Mac to a VGA Monitor or Projector
Works with any Surface Pro or Lenovo X1 Carbon laptops that are equipped with mDP
Passive / DP++ / Dual DisplayPort
Mini DisplayPort 1.2 to VGA Adapter Converter / MDP to VGA / Mini DP to VGA -Mini DP to Projector / Comparable to 0A36536 & 332-2270 / MDP to Projector / Thunderbolt to Projector
Supports Resolutions up to 1920x1200
Maximum portability with compact, lightweight design