Windows based monitoring tool

As my internship i am doing research in a company and looking for a new monitoring tool. Currently we are using Nagios, but here is not enough knowledge about Nagios / Linux, so it's too hard to configure and maintain.

I am looking for a Windows-based monitoring tool that can monitor: -Basic stuff on Windows servers like CPU, disk space, websites and certificate expiration, -VMWare ESX hosts and vm's, -Windows Exchange (queue, user count, log files etc.), -Dell Equallogic (disk usage, interfaces, temperature etc.), and if possible: -Synology NAS (health, temperatue and disk usage)

We are looking for proprietary or saas software, not open source because we don't have the time and knowledge to maintain an open source product.

I'll be looking forward to some suggestions!