We are interested in using Office 365 Enterprise E3. We have SQL Server as a backend to Access forms for our users. Ideally, we'd like to mirror our in-house SQL Server data for web / Sharepoint / Office App access by remote users. Would we need SQL Azure also and is SQL Azure compatible with Office 365 anyway? I also cannot find info about limitations on the web site space with Office 365 E3 and whether PHP etc. can be used with it.