But children of a folder get the same retention policy right? So if Inbox subfolders are used to 'save' items that is an issue. Have I got that right?
From: listsad...@lists.myitforum.com [mailto:listsad...@lists.myitforum.com] On Behalf Of Michael B. Smith Sent: Thursday, June 13, 2013 4:05 PM To: exchange@lists.myitforum.com Subject: [Exchange] RE: Recommendation To Not Create Folders Under the Inbox and Use Top Level Folders in Exchange No, there is no basis for this. At the most basic level, everything in a mailbox is an item. To the Exchange database, an item is one of two types: a folder item or a data item. EVERYTHING else is a property on one of those types of items. A folder item is a container for other items plus a property bag. A data item is leaf node - that is, it is only a property bag. Performance problems occur when key folder items (i.e., containers) get too large. "Too large" is defined by how large an index is required and how many I/O operations are required from starting at the folder root (the base of the key folder) to get the property bag associated with any item. Based on how Exchange builds and rebuilds indices, 3 I/Os are considered OK - because of rather esoteric reasons. More than that are considered "too many". In Exchange 2010 and 2013, these means you can have up to about 100K items in the key folders without negatively affecting performance. This does not affect their children. I realize this may be more detailed than you wanted. But I think I'll take it and turn it into a blog post. :) From: listsad...@lists.myitforum.com<mailto:listsad...@lists.myitforum.com> [mailto:listsad...@lists.myitforum.com] On Behalf Of Aakash Shah Sent: Thursday, June 13, 2013 3:46 PM To: exchange@lists.myitforum.com<mailto:exchange@lists.myitforum.com> Subject: [Exchange] Recommendation To Not Create Folders Under the Inbox and Use Top Level Folders in Exchange A colleague is considering recommending to users to not create folders underneath their Inbox, but to rather create them at the root of the mailbox in Exchange since it is supposed to affect performance and can cause client and server side issues. It appears that there is an issue with Outlook 2011 for the Mac<http://www.valiant-ny.com/2012/10/outlook-2011-for-mac-and-exchange-sync-issues>, but I have never heard of this being a problem in Outlook 2010/2013 for Windows. I have not been able to find any official documentation stating that Outlook for Windows has problems with folders under the Inbox. But, I wanted to ask the community whether there was any basis behind this and should we be recommending to our clients to not file folders under their Inbox? Thanks, -Aakash Shah
