
This is another process that can slow things down.

In Outlook go to Tools > Options > Preferences tab > Search options. Use of indexing within Outlook, especially if you're running it on an older Windows and have installed Microsoft Windows Desktop Search, can really slow things down. #3: Install the new Office release updates In general, email software is not intended for use as an electronic document archive. But it'll make a difference, which is why we mention it again. It's painful to re-organize all that mail. #2: Did we mention trimming your mailbox down? " Creating subfolders under the Inbox, for example, won't really fix the problem. It's important that the subfolders be directly under (formally, "children" of) the root of your mailbox - marked "Mailbox. You'll still have access to them, but Outlook won't have a gigantic indexing task every time you do something. This is an IMAP limitation and not an EnsureMail or Outlook limitation.Ĭreate subfolders and move the archival stuff out, particularly out of your Inbox and Calendar. Exchange is more tolerant to folder count. If you do need more than a 100 folders, then the solution is request from to upgrade your mailbox to Exchange 2016 100GB. This is an IMAP protocol limitation where there is a performance hit once you hit 10,000 emails per folder or if you also have over 100 folders and sub folders. If it shows more than 8,000 to 10,000 items, you've got too many, especially in the main folders of INBOX, SENT, DRAFTS and TRASH. If you can do only the first one, you'll probably experience significant relief.ĭo you have every email you've received in the last few years in your inbox? Is your Sent Items folder just as packed? When you're in a folder, look at the "item count" in the lower left.

There are lots of potential causes, and so lots of potential "tweaks" to improve performance. If you have already done all what was recommended at: How To Fix Slow Outlook IMAP Folder Synchronization IssuesĪnd feel that there is still some slowness, please check below additional tips:
