We've thought about this a lot, and this answer is essentially a brief overview of how we solved this problem.
Get rid of "Solutions"
I've tested this on a number of occasions (with Crazyegg heatmaps and equivalent click mapping in GA) and found that users generally don't click on or use this menu item. I don't have data that proves why, but I'm assuming it's for the same reason I wouldn't click on that item - because 'solutions' sounds like "sales-marketing-speak". As terms go, it's less concrete and more abstract. It's unclear, just from the term, what I should expect when I click.
Use 'Products' and sub-categorize under that
'Products' is a clear and concrete term that users will understand. How you subcategorize will depend on your customers and how well you understand them.
We went with "By business type" and "By category", the latter just being logical groups of products based on their functionality or technology type.
(here's our product page, where you can also the the main menu, minus the 'Solutions' item https://www.globalsign.com/en/products/)
