Glen's Exchange and Office 365 Dev Blog

If you looked at the folder structure in an Office365 Mailbox (or older Exchange Mailbox) using a MAPI editor so you could see all the Non_IPM_Subtree and hidden folders around 5 years ago it was a relatively simple picture. Today with the rapid pace of the change in Office365 its a little bit of minefield on new folders and hidden data that is stored and used by various applications in your Mailbox. A good case in point is the Files Hidden folder which Tony explains about in https://www.petri.com/mysterious-files-folder . Microsoft Teams is the new kid on the block in terms of collaboration applications that integrate into Mailboxes and other Office365 workloads. As you chat using the Microsoft Teams client as part of it compliance/discoverability process associated with Microsoft Teams a cloud-based process creates conversation items in a Hidden folder in your Office365 Mailbox called TeamChat (this is a Subfolder of the Conversation history). Because its a hidden folder users won&#

Preface Searching Mailboxes is something I've written a fair bit about in the past but in this article I'm going to cover how searching has been surfaced in the new REST API on Office365 and Exchange 2016.  The first place to go when considering searching in Office365 is the Security and Compliance center  https://support.office.com/en-us/article/run-a-content-search-in-the-office-365-security-compliance-center-61852fd9-fe8a-4880-a339-cb19ed3bff4a  it offers the most feature rich and realistic search experience that is difficult to replicate with client facing Mailbox API's (eg things like RBAC's delegated access rights, litigation holds etc). Given the amount of data that can be stored in Mailboxes now its important to have a realistic expectation of the time it will take and difficulty of searching 100,000's items in multiple folders or millions of items in an Archive is important (at the time of writing Archives aren't accessible using the REST API). S