I have an application made with visualforce pages and apex classes, exposed to users through customer portal. There is any way to expose the same application through communities instead of customer Portal? If it is possible, how do I achieve this?
It should be possible. Their are a few points of considerations that you can follow. For example:
1) Do you want to simply embed your visualforce into a lightning component and expose it? Their are pros and cons to consider but may be an approach. It is possible to embed.
2) Do you want to build a new lightning component to style it to match styling in the community? A bit more work to do some rewrites to your class and build a new lightning component. Long term this is nice as its a transition completely away from visualforce entirely.
Unfortunately, you'll need a consultant most likely to do this work but fortunately, the Salesforce community has many options here.
