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I was looking for a comprehensive comparison between the P1 and Enterprise Sku’s (E1-E4). As I searched I found several conversations and posts about what can you and can’t you do. I found a good FAQ out on the Office 365 site - http://www.microsoft.com/en-sg/office365/faqs.aspx. I also found our Plan Overview information - http://www.microsoft.com/en-sg/office365/plans.aspx, but as I continued to search, there seemed to be a lot of questions in forums. I ran across this resource at Office365Answers.com. It is a great post and gives a good comparison of what you can expect with the P1. Brett, the author, has even updated it to reflect some recent changes. He is currently on Version 1D updates 08/23/2011. Check out his post at: http://www.office365answers.com/AllArticles/ID/2344/Office-365s-P1-Plan-What-you-must-know.aspx
Here is a snipit of his information, please go to the article for more details:
The P1 plan costs $6 per month per user with a minimum of 1 user – an excellent value.
The services are delivered from the same platform and data centers as the E plans and include Exchange Online, SharePoint Online, and Lync Online.
Important features available in both the P1 and E plans include:
In fact, the P1 Plan includes hundreds of features, all for less than the cost of a movie ticket.
Of course, for the price, limitations are to be expected. What follows is a list of differences between the P1 and E Plans, compiled from multiple sources.