Some can make use of a network-attached drive and manage content as though it were local. Keeping Current Turnkey Internet servers are meant for quick and simple implementation, yet you shouldn't overlook the vendor's schemes for upgrading hardware and software. Upgrades to disk space and WAN connections and improved performance may be in your organization's future. Also, for better functionality and for plugging security holes, investigate your vendor's software updating mechanisms. Security lapses can be exploited at any time, and you'll need to be able to make quick and painless updates to your server.
Some vendors offer free updates for a year or so after purchase.
In addition, look for vendors that send regular updates to customers with notifications of code updates, fixed bugs, security patches and enhanced features. That way, you won't have to download large code updates for features you don't even use. As we all know, features and functionality are constantly changing. A few years ago, POP mail would have been just fine. But with the advent of IMAP and server-based mail folders, you'd want to be able to upgrade to that functionality without a complete hardware change.