The biggest names in online productivity suites are Google Apps and Office 365. But it can be a minefield to figure out the array of functions and the costs of each for a handful of users versus a corporation with 500-plus users.

Narrowing down the costs of each suite based on the number of users is easy with the Google Apps vs. Office 365: A side-by-side cost analysis.

Topics discussed include hosted email, mobile email from an array of devices, ability to host a public website, ability to use a company's own domain name and email addresses, ability to manage user accounts, calendar sharing, encrypted connectivity for security, 24/7 phone support, and a 99.9 percent uptime guarantee.

The cost analysis includes a toolkit in the download to allow for quick comparisons of Google Apps for Business, Google Apps Vault, Office 365 Small Business, Office 365 Small Business Premium, Office 365 Midsize Business, Office 365 Enterprise E1, Office 365 Enterprise E3, and Office 365 Enterprise E4.

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Read more about the two productivity suites and options in the cloud with ZDNet's recent article on Office in the cloud and previous TechRepublic articles summarizing the features of both options.

Download the full cost comparison toolkit here: Google Apps vs. Office 365: A side-by-side cost analysis

This article originally appeared on ZDNet.