I have been working with it for more than 15 years. 

We work with Citrix Endpoint Management among other Citrix components, including Workspace, Gateway, NetScaler, and more. We are service providers.

I've been using this solution for a few years. 

I have used the solution for more than nine years.

2 years and 6 months.

We have been using Citrix Endpoint Management since January. So I have been working with it for roughly eight months.  

2.5 years. Basically from 2012 to mid 2014.

I have been providing this solution to customers for almost 10 years now. 

2 years.